Federal Railroad Administration, DOT § 236.501

which display aspects with indications form to the requirements of this section on more favorable than ‘‘proceed at re- the effective date of this part into con- stricted speed’’ have been opened di- formity with this section in accordance with rectly or by shunting of circuit. the following schedule: Not less than 33% during calendar year NOTE: Each carrier subject to this rule is 1984. hereby authorized to remove electrical or Not less than 66% during calendar year mechanical locks now installed within the 1985. purview of § 236.410 when either exception (1) The remainder during calendar year 1986. or (2) of the present rule is satisfied, subject to the condition that the following proce- [33 FR 19684, Dec. 25, 1968, as amended at 49 dures and actions be accomplished: FR 3386, Jan. 26, 1984] 1. Each carrier intending to remove a lock under the findings made herein and based on RULES AND INSTRUCTIONS the existence of one or more of the cir- cumstances as set forth in exception (1) or (2) § 236.426 rules and in- as contained in the revised section, shall: structions applicable to traffic con- (a) Notify the FRA by letter setting forth trol systems. the location of the lock involved and the spe- The rules and instructions prescribed cific exception on which removal is based. (b) Include in the letter to the FRA an as- in §§ 236.327 and 236.328, § 236.330 to surance that the excepting circumstance re- § 236.334, inclusive, and § 236.342 shall lied upon will not be changed without either apply to traffic control systems. reinstallation of the electric or mechanical lock, or approval by the FRA of the changed INSPECTION AND TESTS circumstances. (c) Publish in its Time Table the not-to-ex- § 236.476 Interlocking inspections and ceed 20 miles per hour speed limit covering tests applicable to traffic control the area of the switch, when that is the ex- systems. ception relied upon; or, where exception (2) is relied upon, publish either in the Special In- The inspections and tests prescribed structions part of its Time Table or in sepa- in §§ 236.377 to 236.380, inclusive, and rate printed Special Instructions the loca- §§ 236.382, 236.383, and 236.386 shall apply tion of each hand-operated switch where to traffic control systems. electric or mechanical lock is removed and, where movements are made in excess of [49 FR 3386, Jan. 26, 1984] twenty (20) miles per hour, concurrently issuing specific instructions, by stating Subpart E—Automatic , therein, that are not to be permitted Train Control and Cab Signal to clear the main track at such switch. 2. Following the foregoing, and upon ac- Systems knowledgment of the letter to the FRA, such acknowledgment to be made promptly as an STANDARDS administrative action by the FRA’s Bureau of Railroad Safety, and such acknowledging § 236.501 Forestalling device and letter to be retained by the carrier as au- speed control. thority for the removal and as a record of (a) An system the exception on which relied, the lock may may include a device by means of then be removed. which the automatic application of the (c) Where a signal is used in lieu of brakes can be forestalled. electric or mechanical lock to govern (b) system movements from auxiliary track to shall include one or more of the fol- signaled track, the signal shall not dis- lowing features: play an aspect to proceed until after (1) Low-speed restriction, requiring the control circuits of signals gov- the train to proceed under slow speed erning movement on main track in ei- after it has either been stopped by an ther direction over the switch have automatic application of the brakes, or been opened, and either the approach under control of the engineman, its locking circuits to the switch are unoc- speed has been reduced to slow speed, cupied or a predetermined time inter- until the apparatus is automatically val has expired. restored to normal because the condi- NOTE: Railroads shall bring all hand-oper- tion which caused the restriction no ated switches that are not electrically or longer affects the movement of the mechanically locked and that do not con- train.

517

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00517 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T § 236.502 49 CFR Ch. II (10–1–03 Edition)

(2) Medium-speed restriction, requir- connected with the signal system that ing the train to proceed under medium the failure of the engineer to acknowl- speed after passing a signal displaying edge a restrictive wayside signal will an approach aspect or when approach- cause the intermittent inductive auto- ing a signal requiring a stop, or a stop matic train stop system to perform its indication point, in order to prevent an intended function. automatic application of the brakes. [49 FR 3386, Jan. 26, 1984] NOTE: Relief from the requirements of paragraphs (b) (1) and (2) of this section will § 236.505 Proper operative relation be- be granted, insofar as speed limits fixed by tween parts along roadway and definitions of Slow and Medium speeds are parts on locomotive. concerned, upon an adequate showing by an Proper operative relation between individual carrier where automatic train the parts along the roadway and the control systems now in service enforce speed restrictions higher than those required by parts on the locomotive shall obtain definitions in §§ 236.700 to 236.838 inclusive. under all conditions of speed, weather, wear, oscillation, and shock. (3) Maximum-speed restriction, ef- fecting an automatic brake application § 236.506 Release of brakes after auto- whenever the predetermined maximum matic application. speed limit is exceeded. The automatic train stop or train control apparatus shall prevent release § 236.502 Automatic brake application, initiation by restrictive block condi- of the brakes after automatic applica- tions stopping distance in advance. tion until a reset device has been oper- ated, or the speed of the train has been An automatic train-stop or train- reduced to a predetermined rate, or the control system shall operate to initiate condition that caused the brake appli- an automatic brake application at cation no longer affects the movement least stopping distance from the en- of the train. If reset device is used it trance to a block, wherein any condi- shall be arranged so that the brakes tion described in § 236.205 obtains, and cannot be released until the train has at each main track signal requiring a been stopped, or it shall be located so reduction in speed. that it cannot be operated by § 236.503 Automatic brake application; engineman without leaving his accus- initiation when predetermined rate tomed position in the cab. of speed exceeded. § 236.507 Brake application; full serv- An automatic train control system ice. shall operate to initiate an automatic The automatic train stop or train brake application when the speed of control apparatus shall, when operated, the train exceeds the predetermined cause a full service application of the rate as required by the setting of the brakes. speed control mechanism. § 236.508 Interference with application § 236.504 Operation interconnected of brakes by means of brake valve. with automatic block-signal system. The automatic train stop, train con- (a) A continuous inductive automatic trol, or cab signal apparatus shall be so train stop or train control system shall arranged as not to interfere with the operate in connection with an auto- application of the brakes by means of matic block signal system and shall be the brake valve and not to impair the so interconnected with the signal sys- efficiency of the brake system. tem as to perform its intended function in event of failure of the engineer to [49 FR 3386, Jan. 26, 1984] acknowledge or obey a restrictive way- side signal or a more restrictive cab § 236.509 Two or more locomotives signal. coupled. (b) An intermittent inductive auto- The automatic train stop, train con- matic train stop system shall operate trol or cab signal apparatus shall be ar- in connection with an automatic block ranged so that when two or more loco- signal system and shall be so inter- motives are coupled, or a pushing or

518

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00518 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T Federal Railroad Administration, DOT § 236.529

helping locomotive is used, it can be § 236.515 Visibility of cab signals. made operative only on the locomotive The cab signals shall be plainly visi- from which the brakes are controlled. ble to member or members of the loco- motive crew from their stations in the § 236.510 [Reserved] cab. § 236.511 Cab signals controlled in ac- [49 FR 3386, Jan. 26, 1984] cordance with block conditions stopping distance in advance. § 236.516 Power supply. The automatic cab signal system Automatic cab signal, train stop, or shall be arranged so that cab signals train control device hereafter installed will be continuously controlled in ac- shall operate from a separate or iso- cordance with conditions described in lated power supply. § 236.205 that obtain at least stopping [49 FR 3386, Jan. 26, 1984] distance in advance. RULES AND INSTRUCTIONS; ROADWAY § 236.512 Cab signal indication when locomotive enters block where re- § 236.526 Roadway element not func- strictive conditions obtain. tioning properly. When a roadway element except The automatic cab signal system of automatic train stop, shall be arranged so that when a loco- train control or cab signal system is motive enters or is within a block, not functioning as intended, the signal wherein any condition described in associated with such roadway element § 236.205 obtains, the cab signals shall shall be caused manually to display its indicate ‘‘Proceed at Restricted most restrictive aspect until such ele- Speed.’’ ment has been restored to normal oper- ative condition. § 236.513 Audible indicator. (a) The automatic cab signal system § 236.527 Roadway element insulation resistance. shall be so arranged that when the cab signal changes to display a more re- Insulation resistance between road- strictive aspect, an audible indicator way inductor and ground shall be will sound continuously until silenced maintained at not less than 10,000 ohms. by manual operation of an acknowl- edging device. [49 FR 3386, Jan. 26, 1984] (b) The audible cab indicator of auto- matic cab signal, automatic train stop, § 236.528 Restrictive condition result- ing from open hand-operated or automatic train control system switch; requirement. shall have a distinctive sound and be When a facing point hand-operated clearly audible throughout the cab switch is open one-fourth inch or more, under all operating conditions. a trailing point hand-operated switch [49 FR 3386, Jan. 26, 1984] three-eighths inch or more, or hand-op- erated switch is not locked where fac- § 236.514 Interconnection of cab signal ing point lock with circuit controller is system with roadway signal system. used, the resultant restrictive condi- The automatic cab signal system tion of an automatic train stop or train shall be interconnected with the road- control device of the continuous type way-signal system so that the cab sig- or the resultant restrictive cab signal indication of an automatic cab signal nal indication will not authorize oper- device on an approaching locomotive ation of the train at a speed higher shall be maintained to within 300 feet than that authorized by the indication of the points of the switch. of the roadway signal that governed the movement of a train into a block § 236.529 Roadway element inductor; except when conditions affecting move- height and distance from rail. ment of trains in the block change Inductor of the inert roadway ele- after the train passes the signal. ment type shall be maintained with the

519

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00519 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T § 236.530 49 CFR Ch. II (10–1–03 Edition)

inductor pole faces at a height above § 236.552 Insulation resistance; re- the plane of the tops of the rails, and quirement. with its inner edge at a hmrizontal dis- When periodic test prescribed in tance from the gage side of the nearest § 236.588 is performed, insulation resist- running rail, in accordance with speci- ance between wiring and ground of con- fications of the carrier. tinuous inductive automatic cab signal [49 FR 3386, Jan. 26, 1984] system, automatic train control sys- tem, or automatic train stop system § 236.530 [Reserved] shall be not less than one megohm, and that of an intermittent inductive auto- § 236.531 Trip arm; height and dis- matic train stop system, not less than tance from rail. 250,000 ohms. Insulation resistance val- Trip arm of automatic train stop de- ues between periodic tests shall be not vice when in the stop position shall be less than 250,000 ohms for a continuous maintained at a height above the plane inductive automatic cab signal system, automatic train control system, or of the tops of the rails, and at a hori- automatic train stop system, and 20,000 zontal distance from its center line to ohms for an intermittent inductive gage side of the nearest running rail, in automatic train stop system. accordance with specifications of the carrier. [49 FR 3387, Jan. 26, 1984]

[49 FR 3386, Jan. 26, 1984] § 236.553 Seal, where required. § 236.532 Strap iron inductor; use re- Seal shall be maintained on any de- stricted. vice other than brake-pipe cut-out cock (double-heading cock), by means No railroad shall use strap iron in- of which the operation of the pneu- ductor or other roadway element with matic portion of automatic train-stop characteristics differing from its or train-control apparatus can be cut standard type on track where speed out. higher than restricted speed is per- mitted. § 236.554 Rate of pressure reduction; equalizing reservoir or brake pipe. [49 FR 3386, Jan. 26, 1984] The equalizing-reservoir pressure or § 236.533 [Reserved] brake-pipe pressure reduction during an automatic brake application shall § 236.534 Entrance to equipped terri- be at a rate not less than that which tory; requirements. results from a manual service applica- Where trains are not required to stop tion. at the entrance to equipped territory, except when leaving yards and stations § 236.555 Repaired or rewound re- ceiver coil. and speed until entering equipped terri- tory does not exceed restricted speed, Receiver coil which has been repaired the automatic train stop, train control, or rewound shall have the same oper- or cab signal device shall be operative ating characteristics which it pos- at least stopping distance from the en- sessed originally or as currently speci- trance to such territory except where fied for new equipment. the approach thereto is governed by § 236.556 Adjustment of relay. automatic approach signal. Change in adjustment of relay shall RULES AND INSTRUCTIONS; LOCOMOTIVES be made only in a shop equipped for that purpose except when receiver § 236.551 Power supply voltage; re- coils, electro-pneumatic valve, or other quirement. essential part of the equipment is re- The voltage of power supply shall be placed. Irregularities in power-supply maintained within 10 percent of rated voltage or other variable factors in the voltage. circuit shall not be compensated for by adjustment of the relay.

520

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00520 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T Federal Railroad Administration, DOT § 236.567

§ 236.557 Receiver; location with re- § 236.24 shall take into consideration spect to rail. the delay time. (a) Receiver of intermittent induc- § 236.564 Acknowledging time. tive automatic train stop device of the inert roadway element type shall be Acknowledging time of intermittent maintained with bottom of the receiver automatic train-stop device shall be at a height above the plane of the tops not more than 30 seconds. of the rails, and with its outer edge at § 236.565 Provision made for pre- a horizontal distance from the gage venting operation of pneumatic side of the nearest rail, in accordance brake-applying apparatus by dou- with specifications of the carrier. ble-heading cock; requirement. (b) Receiver of continuous inductive Where provision is made for pre- automatic cab signal, train stop, or venting the operation of the pneumatic train control device of locomotive brake-applying appartus of an auto- equipped with onboard test equipment, matic train stop or train control device shall be maintained with the bottom of when the double-heading cock is placed the receiver at a height above the in double-heading position, the auto- plane of the tops of the rails, and with matic train stop or train control device its outer edge at a horizontal distance shall not be cut out before communica- from the gage side of the nearest rail, tion is closed between the engineman’s in accordance with specifications of automatic brake valve and the brake the carrier. pipe, when operating double-heading [49 FR 3387, Jan. 26, 1984] cock toward double-heading position. § 236.566 Locomotive of each train op- §§ 236.558–236.559 [Reserved] erating in train stop, train control or cab signal territory; equipped. § 236.560 Contact element, mechanical trip type; location with respect to The locomotive from which brakes rail. are controlled, of each train operating Contact element of automatic train in automatic train stop, train control, stop device of the mechanical trip type or cab signal territory shall be equipped with apparatus responsive to shall be maintained at a height above the roadway equipment installed on all the plane of the tops of the rails, and or any part of the route traversed, and at a horizontal distance from the gage such apparatus shall be in operative side of the rail, in accordance with condition. specifications of the carrier. [49 FR 3387, Jan. 26, 1984] § 236.567 Restrictions imposed when device fails and/or is cut out en § 236.561 [Reserved] route. Where an automatic train stop, train § 236.562 Minimum rail current re- control, or cab signal device fails and/ quired. or is cut out enroute, train may pro- The minimum rail current required ceed at restricted speed or if an auto- to restore the locomotive equipment of matic block signal system is in oper- continuous inductive automatic train ation according to signal indication stop or train control device to normal but not to exceed medium speed, to the condition or to obtain a proceed indica- next available point of communication tion of automatic cab signal device where report must be made to a des- (pick-up) shall be in accordance with ignated officer. Where no automatic specifications of the carrier. block signal system is in use train shall be permitted to proceed at re- [49 FR 3387, Jan. 26, 1984] stricted speed or where automatic block signal system is in operation ac- § 236.563 Delay time. cording to signal indication but not to Delay time of automatic train stop exceed medium speed to a point where or train control system shall not ex- absolute block can be established. ceed 8 seconds and the spacing of sig- Where an absolute block is established nals to meet the requirements of in advance of the train on which the

521

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00521 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T § 236.568 49 CFR Ch. II (10–1–03 Edition)

device is inoperative train may proceed § 236.587 Departure test. at not to exceed 79 miles per hour. (a) The automatic train stop, train § 236.568 Difference between speeds control, or cab signal apparatus on authorized by roadway signal and each locomotive, except a locomotive cab signal; action required. or a multiple-unit car equipped with mechanical trip stop, shall be tested If for any reason a cab signal author- using one of the following methods: izes a speed different from that author- (1) Operation over track elements; ized by a roadway signal, when a train (2) Operation over test circuit; enters the block governed by such (3) Use of portable test equipment; or roadway signal, the lower speed shall not be exceeded. (4) Use of onboard test device. (b) The test shall be made on depar- INSPECTION AND TESTS; ROADWAY ture of the locomotive from its initial terminal unless that apparatus will be § 236.576 Roadway element. cut out between the initial terminal Roadway elements, except track cir- and the equipped territory. If the appa- ratus is cut out between the initial ter- cuits, including those for test purposes, minal and the equipped territory the shall be gaged monthly for height and test shall be made prior to entering alinement, and shall be tested at least equipped territory. every 6 months. (c) If a locomotive makes more than § 236.577 Test, acknowledgement, and one trip in any 24-hour period, only one cut-in circuits. departure test is required in such 24- hour period. Test, acknowledgement, and cut-in (d)(1) Whoever performs the test shall circuits shall be tested at least once certify in writing that such test was every twelve months. properly performed. The certification [49 FR 3387, Jan. 26, 1984] and the test results shall be posted in the cab of the locomotive and a copy of INSPECTION AND TESTS; LOCOMOTIVE the certification and test results left at the test location for filing in the office § 236.586 Daily or after trip test. of the supervisory official having juris- (a) Except where tests prescribed by diction. § 236.588 are performed at intervals of (2) If it is impractical to leave a copy not more than 2 months, each loco- of the certification and test results at motive equipped with an automatic cab the location f the test, the test results signal or train stop or train control de- shall be transmitted to either (i) the vice operating in equipped territory dispatcher or (ii) one other designated shall be inspected for damage to the individual at each location, who shall equipment and tested at least once keep a written record of the test re- sults and the name of the person per- each calendar day or within 24 hours forming the test. These records shall be before departure upon each trip. retained for at least 92 days. (b) Each equipped locomotive shall be tested to determine the locomotive [49 FR 3387, Jan. 26, 1984, as amended at 53 equipment is responsive to the wayside FR 37313, Sept. 26, 1988] equipment and shall be cycled to deter- EFFECTIVE DATE NOTE: At 49 FR 3387, Jan. mine the device functions as intended. 26, 1984, § 236.587 was revised. This section (c) Each locomotive equipped with contains information collection and record- intermittent inductive automatic train keeping requirements and will not become stop or non-coded continuous inductive effective until approval has been given by the Office of Management and Budget. automatic train stop or non-coded con- tinuous inductive automatic train con- § 236.588 Periodic test. trol device shall be tested to determine that the pickup of the device is within Except as provided in § 236.586, peri- odic test of the automatic train stop, specified limits. train control, or cab signal apparatus [49 FR 3387, Jan. 26, 1984] shall be made at least once every 92

522

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00522 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T Federal Railroad Administration, DOT § 236.707

days, and on multiple-unit cars as spec- between the signal and the point where ified by the carrier, subject to approval it is necessary to stop the train. by the FRA. [49 FR 3387, Jan. 26, 1984] Subpart G—Definitions

§ 236.589 Relays. § 236.700 Definitions. (a) Each relay shall be removed from For the purpose of these rules, stand- service, subjected to thorough test, ards, and instructions, the following necessary repairs and adjustments definitions will apply. made, and shall not be replaced in serv- ice unless its operating characteristics § 236.701 Application, brake; full serv- are in accordance with the limits with- ice. in which such relay is designed to oper- An application of the brakes result- ate, as follows: ing from a continuous or a split reduc- (1) Master or primary relays of tion in brake pipe pressure at a service torque type depending on spring ten- rate until maximum brake cylinder sion to return contacts to deenergized pressure is developed. As applied to an position in noncoded continuous induc- automatic or electro-pneumatic brake tive automatic train stop or train con- with speed governor control, an appli- trol system, at least once every two cation other than emergency which de- years; and velops the maximum brake cylinder (2) All other relays, at least once pressure, as determined by the design every six years. of the brake equipment for the speed at (b) [Reserved] which the train is operating. [49 FR 3387, Jan. 26, 1984] § 236.702 Arm, semaphore. § 236.590 Pneumatic apparatus. The part of a semaphore signal dis- Automatic train stop, train control, playing an aspect. It consists of a blade or cab signal pneumatic apparatus fastened to a spectacle. shall be inspected, cleaned, and the re- sults of such inspection recorded as § 236.703 Aspect. provided by § 229.29(a). When a loco- The appearance of a roadway signal motive with automatic train stop, conveying an indication as viewed from train control, or cab signal pneumatic the direction of an approaching train; apparatus receives out-of-use credit the appearance of a cab signal con- pursuant to § 229.33, the automatic veying an indication as viewed by an train stop, train control, or cab signal observer in the cab. apparatus shall be tested in accordance with § 236.588 prior to the locomotive § 236.704 [Reserved] being placed in service. [61 FR 33873, July 1, 1996] § 236.705 Bar, locking. A bar in an interlocking machine to Subpart F—Dragging Equipment which the locking dogs are attached. and Slide Detectors and Other Similar Protective Devices § 236.706 Bed, locking. That part of an interlocking machine STANDARDS that contains or holds the tappets, locking bars, crosslocking, dogs and § 236.601 Signals controlled by devices; other apparatus used to interlock the location. levers. Signals controlled by devices used to provide protection against unusual § 236.707 Blade, semaphore. contingencies, such as landslides, drag- The extended part of a semaphore ging equipment, burned bridges or tres- arm which shows the position of the tles and washouts shall be located so arm. that stopping distance will be provided

523

VerDate jul<14>2003 10:17 Oct 31, 2003 Jkt 200206 PO 00000 Frm 00523 Fmt 8010 Sfmt 8010 Y:\SGML\200206T.XXX 200206T