New Developments

CARRIER CONTROL tion is said to afford the additional ranged to be mutually destroying, REPEATER advantage of permitting trailing of which should prove of interest to the switch without damage, yet users of rail motor cars in construc­ THE General Com­ holding the switch closed in either tion and maintenance work. Riders pany, Rochester 2, N. Y., has devel­ the normal or the reversed position, oped a single-channel repeater unit with sufficient force to permit fac­ for carrier control service. It is said ing-point moves at normal yard to be a companion unit to the trans­ speeds. When the machine is power mitter and receiver units, having the operated, the toggle mechanism is same construction and external di­ pushed past center by compressed mensions-91/s in. high, 7 in. wide, air, whereupon the spring-loaded and 8% in. deep. It weighs 8 lb., toggle action forces the switch and is designed for shelf-mounting. points to the opposite position, sim­ The repeater is used where line­ ilar to the action of ordinary toggle wire attenuation becomes severe be­ switches used in electric lighting cause of weather conditions, heavy circuits. Since the holding force of loading of the line due to other fa­ the spring is sufficient to permit cilities, or where small-size line wire must be employed. This unit oper­ ates on a power level of +16 dbm. A particular feature is that the out­ put is essentially constant over wide variations of input voltages and, like

Fuses burn for 10 or 5 minutes

of such cars have sometimes been injured by fragments of torpedoes Machine is designed especially for yards left on the rail an unknown length of time before. The fusee not only advertises itself until completely facing moves, the air is cut off at consumed but, after the lapse of its the end of the stroke, affording ap­ useful life (10 or 5 min.), completely preciable savings in compressed air removes the torpedo, so that it requirements. vVhen the switch is presents no hazard to motor cars trailed, the toggle mechanism is and causes no unnecessary train de­ pushed past center by the move­ lays. Motor-car riders can protect ment of the points, and the spring­ themselves against following trains loaded toggle action forces the for a period of 10 or 5 min., after points to the opposite position. which the flaming flagman exhausts A separate switch circuit con­ itself and burns the torpedo. Fur­ Repeater operates on +16-dbm. power troller, such as the "Union" U-5, is ther details are available direct from level · used in combination with the NA-10 the company. switch machine for the indication of the other G.R.S. carrier control the position of the points and the units, can be operated directly from control of air valve. According to the RELAY TIMER a 12-cell storage battery without manufacturer, the switch machine is recourse to any additional a.c. available with or without a dual.: THE Com­ power supplies or inverters. control mechanism for hand opera­ pany, Rochester 2, N. Y. , has devel­ tion of the switch. When the ma­ oped an 'electronic interval timer, chine is equipped with a hand-throw designated specifically for testing re­ E. P. TOGGLE SP RING lever, it is possible to carry on lays. Called the Syncrograph, this SWITCH MACH INE switching operations during periods device is capable of measuring an in­ when the operators are off duty or dicating intervals as small as 0.0001 THE Union Switch & Signal Com­ when power is unavailable. sec. and as large as 9.99 sec. The in­ pany, Swissvale, Pa., is offering the strument is equipped with termin­ NA'-10 electro-pneumatic toggle als and switches which permit di­ spring switch machine, which is de­ TORPEDO FUSEE rect control, from the Syncrograph signed especially for installation in panel, of pick-up and drop-away op­ yards. In addition to the usual ad­ THE Western Railroad Supply Com­ eration of a relay under test. A se­ vantages derived from the power pany, 2428 South Ashland Avenue, lector switch provides choice of operation of switches in such appli­ Chicago 8, has introduced a new three timing ranges: 0.0,000 to cation, the spring-loaded toggle ac- combined torpedo and fusee, ar- 0.0,999, 0.000 to 0.999, and 0.00 to

September, 1950 R A I l W A Y S I G N A ll N G and C 0 M M U N I C AT I 0 N S 559 and has practically unlimited life, according to the manufacturer. The new unit is a dry-disk, metallic­ type rectifier with a filter in the out­ put circuit to permit voice communi­ cation on the code line without ob­ jectional hum due to rectifier ripple. It is available in two sizes; one size is for code lines requiring energiza­ tion at a voltage within the range of 30 to 220 volts d.c., and its dimen­ sions are 17%-in. wide, 11 1/ 16-in. high and 101/s-in deep. The other size will handle lines requiring en­ ergization at a voltage within the range of 20 to 80 volts d.c., and its dimensions are 12%-in. wide, 111/ 16-in. high and 10 7j 16~in deep. The unit is energized normally from a 110-volt 50j 60j 100-cycle a.c. sup­ ply. During periods of power out­ age, it is energized from a tuned alternator fed from the local 16-volt battery. In most instances, where The Syncrograph is designed specifically for testing relays a tuned alternator is now in service 9.99 sec., so that measurements may graph is designed for operation on a for supplying standby power to code be made of pick-up, drop-away, and 105 to 130-volt 50 to 60-cycle a.c. equipment, the code line may be en­ crossover times for both quick and supply. Standard accessories includ­ ergized from this same tuned alter­ slow-acting relays. ed with the instn1ment, as shown in nator. Time-interval indications are said the illustration, are two shielded ca­ to be given directly as three-digit ble assemblies and a set of alligator readings by means of neon lamps, (!lips, pin plugs, phone jack, and HIGH-SPEED CODED one of which lights in each of three clip-on test probes which plug onto REMOTE CONTROL columns opposite the digit appropri- the cable terminals. The instrument (Not Illustrated) ate· for the indication. Provision is is portable, weighing approximately A new high-speed coded system for made for automatically accumulat- 28 lb., and is supplied complete with the remote control of ing the total of a series of readings in a carrying case which includes space has been developed by the General the indication columns, expediting for the test cables and accessory Railway Signal Company, Rochester the computation of totalized times terminals. 2, N. Y., the system transmitting a and of averages. All indications are control in 0.5 sec. Controls and indi­ completely stable, and are retained cations can be transmitted simultan­ indefinitely by the instrument until NEW C.T.C CO DE eously over __ a pair of line wires-the reset. Interval timing may be LINE UNIT controls by d.c. code impulses and started and stopped by any combin­ THE Union Switch & Signal Com­ the indications by carrier frequency. ation of the following, applied in se­ Codes are checked for completeness quence across the "START" and pany, Swissvale, Pa., introduces a new C.T.C. code-line unit which is before being used, according to the "STOP" terminals: (1) Closing a cir­ designed to provide a highly-satis­ manufacturer. cuit, (2) opening a circuit, (3) apply­ factory source of energy for oper­ Heart of the high-speed coding is ing a positive-going voltage ( + ating C.T.C. code-line circuits. It a free oscillating code transmitter pulse), and (4) applying a negative­ eliminates the code-line battery, having a rate of 540 cycles per min­ going voltage(- pulse). When or + with its maintenance and periodic ute or 9 per second. Two such trans.:. - inputs are used, a four-position replacement; reduces space require­ mitters are located in the control sensitivity switch may be set, so as ments on new installations; requires office, and two at the field location, to permit acceptance only of pulses no maintenance; has no tubes or being paired to handle the controls equal to or greater than a selected moving parts requiring replacement; and indications. When no controls level, with rejection of lower-level are being sent, the control transmit­ inputs. ters in the office and field are locked As one example of how start and so that their armatures are station­ stop input signals may be used, the ary. When the leverman turns a pick-up time of a relay can be meas­ switch or a signal lever, both trans­ ured by using as a start signal the mitters are unlocked simultaneously voltage pulse which appears across and oscillate freely and in synchro­ the relay coil when it is energized, nism. Eight swings of the armature, and by using as a stop signal the or 4 cycles, are enough to transfer closing of a front contact. Similarly, the control information to the field other operating time characteristics location and control the operation of the relay may be measured by ap­ of a switch or a signal. Likewise, proprate use of coil voltage pulses when there are no indications to be and contact openings and closings as transmitted, the indication trans­ start and stop signals. The Syncro- Unit is dry-disk, metallic rectifier mitters in the field and office are

560 R A I L W A Y S I G N A L I N G and C 0 M M U N I C AT I 0 N S September1 1950 locked. The moment a change in in­ dication occurs, both transmitters are unlocked and oscillate in synch­ ronism. Carrier-frequency impulses originating from the field location are transmitted to the control office. In large interlockings where many more indications exist than can be transmitted during eight swings of the transmitters, the indications are grouped in so-called "stations". The first two or three swings of the trans­ mitters are used to identify the sta­ Sketch showing application of continuous inductive receiver coils tion group from which the indica­ tion is coming, and the remaining swings are used to transmit the ; actual indication. In an installation now being planned, almost 50 indi­ cations are required. These are grouped into 5 indicating stations having 10 indications apiece. When · an indication change occurs, the transmitters are unlocked, make 8 swings during which one of the in­ dicating stations is selected and 4 indications are transmitted. The transmitters are again locked for a moment, unlocked, and the re­ maining indications are transmitted from the same indicating station. The Coil is die-moulded in a tough neoprene rubber jacket Provision is also made to store indi­ cation changes while the system is busy transmitting. to be lowered, because the number art of signal bonding. This new of parts required for this receiver machine is the 0-B Hammerhead has been reduced to less than one­ Twindriver which uses closely con­ CONTINUOUS INDUCTIVE third the number required in the trolled ,hydraulic pressure to install RECEIVER COIL former model, making it possible to 0-B Hammerhead signal bonds in install the receiver assembly in less the rail-head for signal track cir­ A new track-receiver coil for use time and requiring fewer parts to be cuits. Designed to replace the ham­ with continuously - controlled cab carried in stock. mer as a bonding tool on major signal systems is being supplied by track relay operations, the machine the Union Switch & Signal Com­ actually is a mobile hydraulic press. pany, Swissvale, Pa. The coil is HYDRAULIC PRESSURE It uses an exact hydraulic force of easily installed and is interchange­ BOND MACHINE 24,000 lb. each time it drives a bond able with existing receivers now in in place. Both terminals are driven use, according to the manufacturer. THE Ohio Brass Company, Mans­ simultaneously. The coil is die-moulded in a tough field, Ohio has developed a machine Developed for use with the 0-B neoprene rubber jacket which is re­ described by railroad signalmen as Twindrill, a precision tool for dril­ sistant to oil, water, heat and de­ an outstanding contribution to the ling holes in the rail-head at the terioration of insulation. The abra­ sion resistance is sufficient to elimin­ ate the need for an additional pro­ tective housing over the coil. The rubber-covered coil is held in posi­ tion by two clamping pieces, sus­ pended around, but not touching the laminated core. By eliminating the need for wedging and the use of heated compounds, the coil may be quickly and easily removed without risk of damage to its insulation. A water-tight polarized plug-con­ nector is part of the receiving coil assembly. The receptacle part of the connector is moulded into the rub­ ber covering of the coil and the plug portion is moulded on the end of a heavy-duty, two-conductor, rubber­ covered cable. A ring nut is used to lock the two parts together. Install­ ation and maintenance costs are said Machine drives bonds at ra'te as high as three per minute

September, 1950 R A I L W A Y S I G N A L I N G and C 0 M M U N I C AT I 0 N S 561 rate of two joints a minute, the for the increased width, this mount­ Twindriver can be used on either ing compares with the d.c. relay standard-T or head-free rail. A shelf mounting, Type 1, described in gasoline engine drives its hydraulic the September, 1949, issue of this pump. The machine weighs only magazine. The overall dimensions 165 lb., and is easily rolled along the including the mounted relay are: rails from joint to joint. This Twin­ Width, 5Vs-in., depth, 11%-in. with­ driver can install three Hammer­ out lea<,ls, height, 10%-in. The head bonds a minute, which is con­ mounting bracket requires no more sidered to be more than fast enough shelf space than the width of the to keep up with the best equipped _ PTV-42 relay itself. track relay gang. Since almost 200 bonds per hour can be installed with the new machine, the manufacturer FORCED-DOWN recommends that the Twindriver be ELECTRIC SWITCH LOCK used with two Twindrills. Using the Twindriver, makes it possible to THE General Railway Signal Com­ install signal bonds in half a day on pany, Rochester 2, N.Y., announces track that represents a full day's the addition of the forced-down fea­ work for a re-lay gang. Thus for ture to their Model-9A electric the other half day the bonding crew .switch lock. The forced-down fea­ is available for other signal work. ture has been incorporateed in the Uniformity of installation, rather mechanism; lever A in the accom­ than speed, however, is the advan­ The ma.rker consists of a vinylite tube panying illustration, forces down tage stressed by the manufacturer. and holds the armature-locking fin­ The hydraulic pressure is controlled wire by a nylon cone-shaped ger in the lock position. The lever exactly for each bond installation. wedge. The tube, according to the is locked in position by stud B on As soon as the maximum pressure manufacturer, is lettered or num­ the locking dog. When unlock is of 12,000 lb. is applied to each bond bered in accordance with the term­ desired, the crank is operated and terminal, a release valve immed­ inal or circuit designation, the print­ lever A rides up on a cam face on iately cuts off pressure. Pressure is ing being done on a special machine the lock dog, releasing its hold on equalized on both driving rams, developed by the company. A max­ the armature. A spring catch has . so there is no possibility of one ter­ imum of four letters or numbers can been added to the mechanism to minal being driven harder than the be imprinted on the tube which is hold the operating crank in the pre­ other. The equalization of pressure % in. long; or a longer tube can be liminary release position while the also helps to align the machine on used with additional letters or num­ trainman awaits electric unlock. The the rails. bers. The tube is then slipped on spring catch is automatically re­ The Twindriver's Briggs & Strat­ the wire along with the nylon cone. leased when the case door is closed, ton engine develops 1.3 h.p. at the A special tool can be used to spread to make sure that the crank is re- 2,000 r.p.m. used in the bonding the cone which is slotted to allow operation. Ordinarily, its one-gal­ spread. The two are then pressed to­ lon tank requires filling only once a gether with a pair of pliers with day. The engine drives a seven-cyl­ slotted jaws. The tube and cone can inder radial pump built by Simplex be supplied for various diameters Engineering Company. For the of wire. The tube can be slipped bonding operation, only three of the pump's seven· pistons are needed. over the ears of wire eyelets for in­ sulation. It prevents wire insulation The excess cylinders can be used as replacements as "the originals be­ from fraying where eyelets without ·ears are used, and insulates the ex­ come worn. The driving rams, one for each terminal, are products of posed wire strands. Blackhawk Manufacturing Company and can be serviced with standard replacement parts. They are housed SHELF MOUNTING in a steel alloy body casting that has BRACKET a proved safety factor of three, for FOR PTV-42 A. C. RELAY withstanding the total pressure of 24,000 lb. that is applied with each (Not Illustrated) bond installation. Both the engine BECAUSE of the increased use of and pump use the same grades and plug-in relays, and to permit individ­ quality of oil, even under variations ual shelf mounting of the PTV-42 in temperature. plug-in relay in instrument houses and cases, the Union Switch & Signal Model-9A lock with forced-down feature Company Swissvale, Pa., has devel­ turned to its normal position and the WIRE MARKER oped for this relay a shelf-mounting signals cleared. Two contacts on bracket which is said to be very the controller hold the signal cir­ THE General Railway Signal Com­ similar to that used with many d.c. cuits closed during the preliminary pany, Rochester 2, N. Y., has devel­ plug-in relays. The bracket adapts part of the unlock movement. Upon oped and is now supplying a new the relay for use on the shelf of lockup, the signal circuits cannot be form of wire marker, consisting of a the house or case, yet retains the closed until the crank is fully nor­ vinylite tube held in place on the plug-in· feature of the relay. Except mal. The emergency release mech-

562 R A I l WAY S I G N A ll N G and C 0 M M U N I C AT I 0 N S September, 1950 anism has been structurally re­ signed to provide quick, accurate vised, according to the manufac­ reporting of Pullman and train turer, now having two No. 14-24 space information to ticket sellers. standard binding posts. A resilient It can handle any regular inquiry connection between the emergency regarding train accommodations for release lever and lever C prevents a three-month period in advance, damage to the emergency release· · ,. and enables ticket agents to obtain, mechanism if an attempt is made to within a few seconds, a complete operate it when the hold-clown visual report of accommodations feature is in effect. available on any designated train, without the need for contacting a reservation clerk. The necessary NEW LAMP BULB telephone traffic is reduced to that required for confirming the sale of (Not Illustrated) space with the personnel at the res­ A new light bulb for use in signal ervation bureau. The Infomat lamps is now available from the equipment, according to its maker, VVestinghouse Lamp Division, consists essentially of the ticket Bloomfield, N. J. Designed to re­ agents, sets and associated appar­ place oil-burning lamps now in use atus, which are located in the ticket at an estimated 500,000 switches The Megger is available in two ranges throughout the country, the new bulb will greatly reduce mainten­ earth of ground connections. The ance time and expense, according to instrument is said to provide a de­ a recent announcement by the man­ pendable and easy method for as­ ufacturer.. The bulb became practi­ certaining if the resistance to earth cal upon the development of a new of man-made grounds is sufficiently type primary battery by the Primary low, to ensure their correct opera­ Battery Division of Thomas A. Edi­ tion and to minimize dangers due to son, Inc. Lamp life is expected to lightning. It has its own generator exceed the ten months that the bat­ for supplying test current and is, tery can operate continuously, but therefore, always ready for service for lowest maintenance cost, the without dependence on battery or lamp will be replaced at the time other supply. The terminal arrange­ the battery is replaced. The lamp ment employs two switches which is available in ratings of 0.15 amp. short-circuit the terminals for two, at 2.7 volts, and 0.12 amp. at 3.5 three and four-terminal tests, and volts. The inside frosting of the each instrument has two scales, per­ bulb diffuses the light to approxim­ mitting open, well-proportioned ately oil-lantern-flame size, making markings. Two ranges are avail­ it possible to retain existing optical able, 0 to 40 and 0 to 200 ohms; systems in converting. 0 to 100 and 0 to 500 ohms. Com­ plete information is contained in Bulletin 25-80-.'36. CVM MEGGER THE James G. Biddle Company, SPACE RESERVATIONS 1316 Arch treet, Philadelphia 7, Pa., has announced a new Megger THE Union Switch & Signal Com­ Selecting month on ticket agent's set ground tester, known as the Type pany, Swissvale, Pa., announces the CVM, for measuring resistance to new Infomat~ system, which is de- offices, and can be placed in plain view of customers; and the record­ ing machine, which is located at the reservation bureau. On the ticket agent's set, controls consisting of dials and push-buttons are conveniently loc~ted on the lower panel, and manipulation of these controls in a logical sequence transmits to the recording machine a «requesC specifying the month, day, destination and train on which accommodations are desired. This "requese is interpreted by the ap­ paratus in the recording machine and a "report" is automatically re­ turned. All accommodations avail­ able on the designated train are then indicated by lighted lamps in the panel at the top of the ticket agenfs Internal electrical connections and mechanical operation of Megger *Trade Mark

Sep:ember, 1950 R A I l WAY SIGN All N G and C 0 M M U N I CAT I 0 N S 563 ability. The additional sets may be separately mounted on pedestals or on counters. Each ticket office is connected to the recording machine at the reservation bureau by a two­ wire line circuit. Where several ticket offices are located in the same general direction form the reserva­ tion bureau, they may be connected to the same pair of wires and con­ trolled separately by individual car­ Recording ma­ rier units. Telephone communica­ chine is locat­ tions can be handled over this same ed at the res­ ervation bureau line circuit. Among the Infomat system's num­ erous advantages, one of the most impmtant is said to be its high pub­ lic relations value to the railroad. For example, since the ticket agent's set can be located in plain view of the customer, he can watch as the agent makes the necessary manip­ ulations to request ·the train space information, and when the indica­ tion lights become illuminated a few seconds later, he can actually see for himself what accommodations are available. Another important con­ sideration from the customer stand­ point is the greatly reduced time required for the handling of reserva­ tions. Another advantage of the Infomat system is the extreme sim­ plicity of operation, which makes set. From this information, the cus­ stored in trays at the bottom of the the ·· selling of reserved space so tomer can select the accommodation front plate. This arrangement also simple and direct that existing per­ desired. The accompanying photo­ facilitates visual scanning of the sonnel in ticket offices and reserva­ graphs and captions show how a posting board, so that verbal re­ tion bureaus can handle the system typical request is handled. quests from offices not connected to with only a very short period of The recording machine for the the Infomat system can be handled instruction. reservation bureau is composed of more efficiently. With all receptacles standard sections approximately 2% vacant, the recording machine will ft. wide, 6 ft. 9 in. high and 18 in. automatically report that all classes SWITCH MACHINE deep. If the size of the installation of space are available. Insertion of CONTROLLER requires it, a number of sections can a plug in a particular receptacle pre­ be assembled end-to-end to form a conditions the machine circuits so THE General Railway Signal Com­ single integral machine. The front that subsequent "reports" will indi­ pany, Rochester 2, N. Y., now offers plate or posting board of the record­ cate that the associated space is not a biased-neutral switch machine ing ·machine provides a continuous available. If space becomes available record of all reserved space on trains because of a cancellation, the plug departing from the terminal. As can is removed from the proper recep­ be seen in the illustration, the panel tacle so .that availability of that is arranged in sections for the va­ space will then be reported in the rious classes of reserved space. Each regular manner. Facilities are pro­ of these sections is subdivided to vided in the Infomat recording ma­ provide a panel for each train chine for adding or removing accom­ carrying that particular class of modations from any train, and for space. Each panel has three rows of handling additional trains. receptacles, with 31 receptacles in The Infomat system illustrated is each row, thus covering a three­ designed to handle as many as 15 month period in advance. To indi­ different types of accommodations cate through the system that a par­ for 90 days in advance on a max­ ticular class of space on a train is imum of 256 train-destinations. The sold out for a particular day, a col­ number of ticket offices which can ored plastic plug is inserted in the be connected into the system is lim­ proper receptacle on the board. In ited only by practical considerations. order that months of the year can Also, at busy ticket offices several readily be identilied_,_ these plugs are ticket agent's sets can be handled provided in different colors. The by one operating unit, the number color code is shown at the top of of sets handled at a given office the posting board. Loose plugs are being limited primarily by practic- Fig. !-Controller is biased-neutral unit

564 R A I l W A Y S I G N A L l N G and C 0 M M U N I C A T I 0 N S September, 1950 mounted, shelf-mounted or plugged into a B relay rack. It takes the rack space of two Type-B, Size-2 relays. The contactor, overload relay, and cover are all removable as a unit by simply taking out the screws MOTOR­ that hold the cover in place. These CONTROL CONTACTS controllers are available for 10 to 12-volt and for 24 to 32-volt d.c. L_r_j control. Operating voltage may be 24 or 110 volts d.c. WHEN EITHER CONTACTOR Cl OR C2 PICKS UP TO MAKE FRONT CONTACT IT NEW STYLE W-12 \------+------<~- FORCES THE OPPOSITE CONTACTOR TO MAKE TRANSFORMER ITS BACK CONTACT. THE Union Switch & Signal Com­ pany, Swissvale, Pa., announces a Fig. 2-Simplified circuit for biased-neutral contr~ller new transformer, Style W-12, which is said to have been developed par­ ticularly as an output transformer controller for mounting either on a mum of 0.007 amp. at 10 volts). This for use with a tuned alternator. The tower rack or in a wayside housing. makes normally energized control transformer provides better output The controller, Fig. 1, is said to pro- practical and economical-although wave shape than the usual output vide two-wire polarized control of not essential to operation of the con­ transformer-tuned alternator com­ any G.R.S. switch machine. This con- troller. bination, because of the use of a troller make its possible to operate (2) Both contactors are in mul­ liberal . air gap in the magnetic cir­ a switch over a greater distance than tiple when the switch machine is cuit, together w1th capacitors of rel­ is practical over direct wire from the unlocked, but only one is taking atively large rating. The transformer switch-control lever. In locations current. The only current through is compact for its rating, and carries subject to flooding, it is advanta- the other contactor is that permitted the necessary arc-suppressing capac­ geous to use this controller in a way- by the backleak of the rectifier. This itors mounted as part of the trans­ side housing above high-water level, permits the use of control wires former assembly. This arrangement instead of using a built-in type of with higher resistance than is prac­ saves wiring and space in the instru­ controller, such as is supplied in ticable with present controllers. ment case, and practically eliminates Model-5C and D switch machines. (3) Since only one contactor is the possibility of the capacitors be­ As shown in the_ simplified circuit, energized when the machine is un­ coming disconnected with resultant Fig. 2, the controller contains two · locked, and since both contactors biased-neutral contactors and an are connected in multiple, there is overload relay. Each biased-neutral a tendency for the deenegized contactor is primarily a neutral re- contactor to absorb the inductive lay. It has a permanent magnet lo- surge produced by the other con­ cated between the cores in such a tactor when the control energy is in­ way that the armature will operate terrupted in midstroke. only when current is flowing in one The magnetic structure also has a specified direction (indicated by ar- leakage strip, so that depreciation or rows in the coils in Fig. 2). Although even removal of the alnico perma­ the half-wave rectifier between the nent magnets could not cause the coils fixes the possible direction of contactor to respond to the wrong current flow, the magnetic structure polarity. The overload relay is said is such that the contactor will not to be substantially the same as has pick up when voltage of the wrong been supplied in the past. It has an polarity is applied, even if the recti- operating coil and a holding coil. fier were removed from the circuit. The operating coil is in a series with Laboratory tests show that if 10 the motor circuit so an abnormally volts applied in the proper direction large current will open the motor are required to pick up the arma- circuit. The holding coil keeps the ture, it would require at least 4,000 motor circuit open until the control volts in the wrong direction to pick circuit is pole changed. Pickup time it up. can be varied by an adjusting screw. The rectifier is used for the fol- Figure 1 shows the controller with lowing reasons: A.A.R. binding posts. It is also avail- (!) It permits a relatively high- able with a plug coupler or as a energy input to the contactor. As plug-in unit that can be mounted on Unit is for use with tuned alternators soon as the motor-control contacts a regular Type-B relay rack. All within the switch machine have op- contacts are visible through a trans­ destructive arcing on the tuned erated in response to the energiza- parent window. Dimensions are: alternator contacts. tion of the control circuit, the energy depth, 71/z in.; width 91/z in.; A typical rating for the W -12 input to the contactor is cut down heighth, 10% in. with binding posts, transformer is 115 volts, 250 v.a., to the amount permitted by the 11 in. with plug coupler. Weight is 100 cycles output, with primary backleak of the rectifier (a maxi- 31% lb. The controller may be wall- winding for use on six cells of lead

September, 1950 R A I L W A Y S I G N A L I N G and C 0 M M U N I C A T I 0 N S 565 storage battery. Taps are provided on the output winding for adjusting one of the capacitors to provide best arc suppression. The transformer can be supplied for use with tuned alternators of any usual power fre­ quency and battery supply, and for any · common output voltage. The combination of a .. Union" tuned alternator and a W-12 output trans­ former provides an excellent method of obtaining alternating voltage from a battery, especially for intermittent or standby service.

BROAD-BAND, NARROW­ BAND CODED CARRIER THE Union Switch & Signal Com­ pany, Swissvale, P'a., announces the availability of their broad-band, nar­ through terminal .. B", to terminal the control point on the same broad­ row-band coded carrier control sys­ "E", where the carrier codes are band carrier that handles indication tem for consolidating at one point, converted to d.c. codes and trans­ codes from interlockings "A", "B" such as at division headquarters, mitted to interlockings "D", "E", and and "C". ·the control of a series of remote "F". Indication codes, originating at The carrier circuits, as well as d.c. interlockings. In this system, con­ interlockings "A", "B" and "C" in circuits for interlockings "A", "C", hols and indications are carried by the form of d.c. impulses, are trans­ "D" and "F" are all handled on the broad-band carriers between term­ mitted to broad-band .terminal "B", same pair of line wires. Since inter­ inals at the control point and one or where they are converted to narrow­ lockings "B" and "E" are located at more field locations, according to band carrier codes. These coded car­ the broad-band carrier terminals, it the maker. The necessary channels riers are used to modulate the broad­ is not necessary to transmit the d.c. for the controls and indications of band carrier handling indications, codes for these interlockings over the interlockings are obtained by us­ and are transmitted back to the con­ the line wires. For simplification, in ing a group of narrow-band carrier trol point. Similarly, the d.c. indica­ Fig. 1, only two broad-band chan­ frequencies to modulate each broad­ tion codes originating at interlock­ nels are used for control and indi­ band carrier. Therefore, separate ings "D", "E" and .. F" are trans­ cation and six associated narrow­ broad-band carrier frequencies serve mitted to terminal 'E", where they band channels for each broad-band to transmit each group of narrow­ are handled in the same manner as channel are shown. However, addi~ band carrier frequencies in a separ­ at terminal "B", and transmitted to tional broad-band and narrow-band ate "compartment". And,, since 'the channels can be used as required. frequencies assigned to each group This limiting of the over-all carrier­ . of narrow-band carriers can be J;'e­ frequency range required for the peated in each .. compartment'', the control of an extensive consolida­ controls and indications of an exten­ tion of remote interlockings is said sive series of interlockings can be to be the outstanding advantage of confined to a relatively narrow range the system. Another important ad­ of frequencies handled by a few vantage is that where repeaters are broad-band carriers. required, each modulated broad­ Figure 1 illustrates a typical line band carrier can be handled by a plan for using the broad-band, nar­ single repeater. The broad-band, row-band system to control a series narrow-band coded carrier control of six remote interlockings. Two system will handle large installa­ broad-band carriers are employed, tions using the "Union" Form 504, one modulated by a group of six nar­ 506 or 510 Systems, or any combina­ row-band carriers assigned to handle tion of them. controls, the other modulated by a group of six narrow-band carriers as­ WIRING HARNESS FOR signed to handle indications. . The broad-band carrier terminals are lo­ SWITCH MACHINE cated at the control point and inter­ (Not Illustrated) lockings "B" and "E". At terminal THE Union Switch & Signal Com­ "B", the control codes handled on pany, Swissvale, Pa., announces the narrow-band carriers assigned that they have adopted as standard to "A", "B" and "C" the use of a wiring harness for elec­ are converted to d.c. control codes tric switch machines. The new har­ and transmitted to their' respective ness can also be :r·eadily f!.ppl,ied to ititeHockings in the -usual' manner. ..Union" electric switch ma·chines The narrow-band carriers ·handling with up-to-date terminal boards and the,. control codes for interlocking standard wiring, that were in service "D", "E" ~nd "F" · are "passed" Panel-mounted. equipment for system prior to adoption of the new harness.

566 R A I L W 'A Y . 'sIGN)., ll. N G and C 0 M M U N I C An 0 N S September, 1950 It is made up of No. 14 and No. 12 and commercial racks, but a differ­ great enough to seriously reduce the plastic insulated wire, bound to­ ent relay-filter assembly is required insulation value of the concrete box. gether with plastic electrical tape. for case mounting, as this arrange­ Insulation board can be supplied Wires carrying motor current are ment permits mounting the new for side walls if desired. No. 12 and all others are No. 14. panels on the top of. existing cases The harness is oil and moisture re­ with only slight modification. The sistant, according to the company, new equipment is said to give the and · ;uses:' pressure-type terminals railroads maximum flexibility with INDUCTIVE TRAIN that -give support to the insulation respect to handling their coded car­ IDENTIFICATION of the wire. The support around the rier cqntrol systems. For example, SYSTEM wire insulation is itself insulated. commerdal ·racks can be installed The leads on the circuit-controller at the office, where there is a con­ THE Union Switch & Signal Com­ end of the harness are bound into a centration of carrier equipment, and pany, Swissvale, Pa., announces a form, so that they will lay in place individual racks can be installed in new system for identifying trains, on the .proper terminal of the circuit the Reid. Or, any other desired com­ known as the .. Union" inductive controller. Leads on the terminal­ bination can be used, and since the train identification system. It was board end are numbered, and are panels are interchangeable, the developed especially to meet the applied to the same-numbered ter­ amount of spare panels required for need for a method of indicating the minals on the terminal board, as are maintenance is minimized. An illus­ destination of approaching trains illustrated on the diagram which is tration of panel-mounted carrier to the operators at interlockings, and furnished. Internal wiring diagrams equipment is shown elsewhere in is said to be of great value in avoid­ of the switch machine are also fur­ these columns under the items, ing incorrect routing, particularly nished with each harness that is "Bro~d-~and, Narrow-Band Coded where trains are operated on a supplied for Reid application. Carner. close headway. It also has many other possible applications where a reliable method of train identifica­ AIR CELL BOXES tion is desired. One of the chief fea­ PANEL MOUNTED tures of the new system is the sim­ CARRIER EQUIPMENT THE Permacrete Products Corpor­ plicity of the train-carried equip­ THE Union Switch & Signal Com­ ation, 1839 South Wall Street, ment, which consists simply of a coil pany announces that its coded car­ Columbus 7, Ohio, has developed a and tuning condenser in a suitable rier control equipment is now avail­ line of concrete battery boxes for mounting, and does not require any able for pa,nel mounting on individ­ the express purpose of housing air souces of energy on the train. Since ual racks or cases manufactured by cells for electric switch lamp light­ the number of train-carried units ing projects. At double switch lo­ would normally be considered great­ cations the two-cell . box may be er-especially on rapid transit lines­ used. The boxes are said to provide than the number of wayside stations, permanency, protection and ready the system affords maximum install­ access for both visual inspection and ation economy. The wayside equip­ maintenance. The metal cover can ment consists of a combined trans­ be locked to the vent cover for se­ mitter and receiver coil, mounted curity as shown. Vents are large adjacent to the track; an electronic enough to supply the necessary air oscillator unit for energizing the for breather-type cells, but not transmitter coil; and a pretuned am-

23 " 12 ------j SH[l RIINFORCED . AIR fMTRAitHD CONCRETE

r------1 r------I I 19' I - r--;. I I I :l-----; I AIR. I I f I em I I BAlTERI[S ·1 UNITS 1 I I I f- I I I I I I - : :_ :· -- r-2-I - I --~ - - f-- I I I E I I ~ I c I I I I I I I I I I I I I I I - I ~ I I f- 8" t-______--+ .J L_------__ .J L------~- -~ L- 1 W£JuH1 - 11S l&5. WEivHT 80 l&S PLAN Vl£W- TWO CELL 50X l PlAM · SIMutE CELl B01. Diagram of panel units I G 6AUGf METAL COVER them, or on standard commercial r------1 • I racks. The new equipment is made I I I I up of four panels (see accompanying I I J I I I ~ I plan), as follows: Panel 1, relay-Rl­ '<~1; I I I I I I ter; panel 2, receiver; panel 3, trans­

September, 1950 R A I l W A Y S I G N .A l I N G . and ·C 0 M M:U N I C A T.l 0 N S 567 On the ''J'' (Continued from page 556) Wayside and car - carried controls for Lake street. Time cut coils used outs, similar to those used at Chi­ with induc­ cago Heights, as explained previous­ tive train­ ide n t i fic­ ly, are also included in this Hobart ation system project. Dwarf Signal Rule The dwarf signals used on these crossing protection projects are the type SA, arranged to display either red or green. Below each signal there is a large letter "X" which designates it as a signal associated plifier and indicating relay. A sep­ before starting its run. Where trains with crossing protection, and as arate amplifier and relay are used are pulled by one locomotive, a coil having nothing to do as an auto­ for each identification frequency. can be mounted permanently on the rna tic signal or as an interlocking The system operates by means or locomotive with a tuning selection signal. the magnetic field or inductive key located in the cab for the en­ The bulletins and time table in­ coupling between the wayside and gineman to effect the proper identi­ structions explain that a green as­ car-carried coils. When a tuned coil fication. pect on such a signal indicates that on a train is opposite the wayside the crossing protection is operating coil installation, the coupling from properly, and that a red light may wayside to train coil and back from SOLDERING FLUX indicate that the crossing is not pro­ the tuned train coil to the wayside (Not Illustrated) tected and therefore, care must be receiver coil causes the indicating exercised to prevent accidents to relay for this particular tuning fre­ DIVISION Lead Company, 836 highway vehicles and pedestrians. quency to operate. The selective West Kinzie Street, Chicago 22, has These crossing signal projects tuning of the electronic circuit asso­ announced a new liquid soldering were planned and installed by rail­ ciated with each indicating relay flux, known as Divco No. 229, which road forces under the iurisdiction prevents the other relays from being is said to eliminate practically aE of F. G. Campbell, chief engineer, operated. The equipment will re­ cleaning and burnishing of metal and under the direction of W. K. spond properly no matter how high parts usually ne::::essary before sold­ VValtz, signal engineer. The flash­ or low the train speed may be and ering can be done. It is usable on ing-light signals and gates at Euclid even if the train should stop at the copper, brass, bronze, nickel, cad­ avenue in Chicago Heights were fur­ identification point. The relay cir­ mium, zinc. tin, galvanized iron, nished by the Griswold Signal Com­ cuit can be furnished to restore to steel, monel. Full particulars are pany, and those at Main street and normal automatically in some pre­ available from the manufacturer. Lake street in Hobart were furnish­ determined short time after passage ed by the Western Railroad Supply of the train, or for manual resetting Company. The dwaff signals and by a pushbutton. INSULATED GROMMET relays were made by the General Special circuits are included in the (Not Illustrated) Railway Signal Company. Trans­ amplifier to make the equipment im­ formers and rectifiers were made by mune to false tripping by metal that ANNOUNCEMENT has been made Fansteel. At each crossing, the may come close to the wayside coil by the Automotive Rubber Com­ gate motors are fed from a set of or by stray magnetic or electric pany, Inc., 8601 Epworth Boulevard, 10 cells of 160-a.h. Edison storage fields. There is no appreciable radi­ Detroit 4, Mich., of a newly-de­ batterry at Main and Lake, and 240- ation from the transmitter and con­ signed metal-formed grommet, com­ a.h. at Euclid. Six of these cells are sequently no interference with. pletely covered with rubber, for in­ used also to feed control circuits. other equipment or with identifica­ sulating blanked holes in metal to These batteries are on floating tion of trains on adjacent tracks. The prevent cutting, chafing, shorting charge through Fansteel Balkite rec­ induction field becomes negligibly and rattling of wires, cables, con­ tifiers. Each is fed by small at distances more than two or duits and tubing, which pass through three cells of 500-a.h. Edison pri­ three times its diameter from the the holes. Known as the Arco Sta­ mary battery. The buried cable on transmitter coil. Where trains are Put series 3120, the principal advan­ these projects is double No. 8 for made up of multiple-unit cars, the tages are said to be that it can be the motor feeds and single No. 8 for car-carried coils can be furnished as installed easier and faster than track connections. The insulated separate, demountable units, each grommets previously offered, and wire and cable was furnished by the complete with its condenser pre­ that it holds in position at all times. Okonite Company. tuned to one frequency and ar­ Installation from the face of the hole The crossing protection der;:cribed ranged so that the coil can be re­ is another feature, and an expanding above at Chicago Heights, Ill., was placed with one of another fre­ hand tool is available to roll and installed in accordance with order of quency. Thus, a pool of coils can be force the curled prongs tight against the Illinois Commerce Commission maintained at points where trains the under-surface, assur~ng a p~si­ and that at Hobart, Ind., pursuant to originate, and each train equipped tive secure fit. Further information ordinances of the Common Council with a coil of the proper identity is available from the manufacturer. of that city.

568 R A I L W A Y S I G N A L I N G and C 0 M M U N I C AT I 0 N S September, 1950