§ 236.426 49 CFR Ch. II (10–1–09 Edition)

the control circuits of signals gov- after it has either been stopped by an erning movement on main in ei- automatic application of the brakes, or ther direction over the switch have under control of the engineman, its been opened, and either the approach speed has been reduced to slow speed, locking circuits to the switch are unoc- until the apparatus is automatically cupied or a predetermined time inter- restored to normal because the condi- val has expired. tion which caused the restriction no NOTE: Railroads shall bring all hand-oper- longer affects the movement of the ated switches that are not electrically or . mechanically locked and that do not con- (2) Medium-speed restriction, requir- form to the requirements of this section on ing the train to proceed under medium the effective date of this part into con- speed after passing a signal displaying formity with this section in accordance with an approach aspect or when approach- the following schedule: Not less than 33% during calendar year ing a signal requiring a stop, or a stop 1984. indication point, in order to prevent an Not less than 66% during calendar year automatic application of the brakes. 1985. The remainder during calendar year 1986. NOTE: Relief from the requirements of paragraphs (b) (1) and (2) of this section will [33 FR 19684, Dec. 25, 1968, as amended at 49 be granted, insofar as speed limits fixed by FR 3386, Jan. 26, 1984] definitions of Slow and Medium speeds are concerned, upon an adequate showing by an RULES AND INSTRUCTIONS individual carrier where systems now in service enforce speed § 236.426 rules and in- restrictions higher than those required by structions applicable to traffic con- definitions in §§ 236.700 to 236.838 inclusive. trol systems. The rules and instructions prescribed (3) Maximum-speed restriction, ef- in §§ 236.327 and 236.328, § 236.330 to fecting an automatic brake application § 236.334, inclusive, and § 236.342 shall whenever the predetermined maximum apply to traffic control systems. speed limit is exceeded.

INSPECTION AND TESTS § 236.502 Automatic brake application, initiation by restrictive block condi- § 236.476 Interlocking inspections and tions stopping distance in advance. tests applicable to traffic control An automatic train-stop or train- systems. control system shall operate to initiate The inspections and tests prescribed an automatic brake application at in §§ 236.377 to 236.380, inclusive, and least stopping distance from the en- §§ 236.382, 236.383, and 236.386 shall apply trance to a block, wherein any condi- to traffic control systems. tion described in § 236.205 obtains, and [49 FR 3386, Jan. 26, 1984] at each main track signal requiring a reduction in speed.

Subpart E—Automatic , § 236.503 Automatic brake application; Train Control and Cab Signal initiation when predetermined rate Systems of speed exceeded.

STANDARDS An automatic train control system shall operate to initiate an automatic § 236.501 Forestalling device and brake application when the speed of speed control. the train exceeds the predetermined (a) An system rate as required by the setting of the may include a device by means of speed control mechanism. which the automatic application of the brakes can be forestalled. § 236.504 Operation interconnected (b) Automatic train control system with automatic block-signal system. shall include one or more of the fol- (a) A continuous inductive automatic lowing features: train stop or train control system shall (1) Low-speed restriction, requiring operate in connection with an auto- the train to proceed under slow speed matic block signal system and shall be

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so interconnected with the signal sys- application of the brakes by means of tem as to perform its intended function the brake valve and not to impair the in event of failure of the engineer to efficiency of the brake system. acknowledge or obey a restrictive way- side signal or a more restrictive cab [49 FR 3386, Jan. 26, 1984] signal. § 236.509 Two or more locomotives (b) An intermittent inductive auto- coupled. matic train stop system shall operate in connection with an automatic block The automatic train stop, train con- signal system and shall be so inter- trol or cab signal apparatus shall be ar- connected with the signal system that ranged so that when two or more loco- the failure of the engineer to acknowl- motives are coupled, or a pushing or edge a restrictive wayside signal will helping locomotive is used, it can be cause the intermittent inductive auto- made operative only on the locomotive matic train stop system to perform its from which the brakes are controlled. intended function. § 236.510 [Reserved] [49 FR 3386, Jan. 26, 1984] § 236.511 Cab signals controlled in ac- § 236.505 Proper operative relation be- cordance with block conditions tween parts along roadway and parts on locomotive. stopping distance in advance. Proper operative relation between The automatic cab signal system the parts along the roadway and the shall be arranged so that cab signals parts on the locomotive shall obtain will be continuously controlled in ac- under all conditions of speed, weather, cordance with conditions described in wear, oscillation, and shock. § 236.205 that obtain at least stopping distance in advance. § 236.506 Release of brakes after auto- matic application. § 236.512 Cab signal indication when The automatic train stop or train locomotive enters block where re- control apparatus shall prevent release strictive conditions obtain. of the brakes after automatic applica- The automatic cab signal system tion until a reset device has been oper- shall be arranged so that when a loco- ated, or the speed of the train has been motive enters or is within a block, reduced to a predetermined rate, or the wherein any condition described in condition that caused the brake appli- § 236.205 obtains, the cab signals shall cation no longer affects the movement indicate ‘‘Proceed at Restricted of the train. If reset device is used it Speed.’’ shall be arranged so that the brakes cannot be released until the train has § 236.513 Audible indicator. been stopped, or it shall be located so (a) The automatic cab signal system that it cannot be operated by engineman without leaving his accus- shall be so arranged that when the cab tomed position in the cab. signal changes to display a more re- strictive aspect, an audible indicator § 236.507 Brake application; full serv- will sound continuously until silenced ice. by manual operation of an acknowl- The automatic train stop or train edging device. control apparatus shall, when operated, (b) The audible cab indicator of auto- cause a full service application of the matic cab signal, automatic train stop, brakes. or automatic train control system shall have a distinctive sound and be § 236.508 Interference with application clearly audible throughout the cab of brakes by means of brake valve. under all operating conditions. The automatic train stop, train con- [49 FR 3386, Jan. 26, 1984] trol, or cab signal apparatus shall be so arranged as not to interfere with the

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§ 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 nal indication will not authorize oper- indication of an automatic cab signal ation of the train at a speed higher device on an approaching locomotive than that authorized by the indication shall be maintained to within 300 feet of the roadway signal that governed of the points of the switch. the movement of a train into a block except when conditions affecting move- § 236.529 Roadway element inductor; ment of in the block change height and distance from rail. after the train passes the signal. Inductor of the inert roadway ele- ment type shall be maintained with the § 236.515 Visibility of cab signals. inductor pole faces at a height above The cab signals shall be plainly visi- the plane of the tops of the rails, and ble to member or members of the loco- with its inner edge at a hmrizontal dis- motive crew from their stations in the tance from the gage side of the nearest cab. running rail, in accordance with speci- fications of the carrier. [49 FR 3386, Jan. 26, 1984] [49 FR 3386, Jan. 26, 1984] § 236.516 Power supply. Automatic cab signal, train stop, or § 236.530 [Reserved] train control device hereafter installed shall operate from a separate or iso- § 236.531 Trip arm; height and dis- lated power supply. tance from rail. [49 FR 3386, Jan. 26, 1984] Trip arm of automatic train stop de- vice when in the stop position shall be RULES AND INSTRUCTIONS; ROADWAY maintained at a height above the plane of the tops of the rails, and at a hori- § 236.526 Roadway element not func- zontal distance from its center line to tioning properly. gage side of the nearest running rail, in When a roadway element except accordance with specifications of the of automatic train stop, carrier. train control or cab signal system is [49 FR 3386, Jan. 26, 1984] not functioning as intended, the signal associated with such roadway element § 236.532 Strap iron inductor; use re- shall be caused manually to display its stricted. most restrictive aspect until such ele- ment has been restored to normal oper- No railroad shall use strap iron in- ative condition. ductor or other roadway element with characteristics differing from its § 236.527 Roadway element insulation standard type on track where speed resistance. higher than restricted speed is per- Insulation resistance between road- mitted. way inductor and ground shall be [49 FR 3386, Jan. 26, 1984] maintained at not less than 10,000 ohms. § 236.533 [Reserved] [49 FR 3386, Jan. 26, 1984] § 236.534 Entrance to equipped terri- § 236.528 Restrictive condition result- tory; requirements. ing from open hand-operated Where trains are not required to stop switch; requirement. at the entrance to equipped territory, When a facing point hand-operated except when leaving yards and stations switch is open one-fourth inch or more, and speed until entering equipped terri- a trailing point hand-operated switch tory does not exceed restricted speed, three-eighths inch or more, or hand-op- the automatic train stop, train control, erated switch is not locked where fac- or cab signal device shall be operative

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at least stopping distance from the en- § 236.556 Adjustment of relay. trance to such territory except where Change in adjustment of relay shall the approach thereto is governed by automatic approach signal. be made only in a shop equipped for that purpose except when receiver RULES AND INSTRUCTIONS; LOCOMOTIVES coils, electro-pneumatic valve, or other essential part of the equipment is re- § 236.551 Power supply voltage; re- placed. Irregularities in power-supply quirement. voltage or other variable factors in the The voltage of power supply shall be circuit shall not be compensated for by maintained within 10 percent of rated adjustment of the relay. voltage. § 236.557 Receiver; location with re- § 236.552 Insulation resistance; re- spect to rail. quirement. (a) Receiver of intermittent induc- When periodic test prescribed in tive automatic train stop device of the § 236.588 is performed, insulation resist- inert roadway element type shall be ance between wiring and ground of con- maintained with bottom of the receiver tinuous inductive automatic cab signal at a height above the plane of the tops system, automatic train control sys- of the rails, and with its outer edge at tem, or automatic train stop system a horizontal distance from the gage shall be not less than one megohm, and side of the nearest rail, in accordance that of an intermittent inductive auto- with specifications of the carrier. matic train stop system, not less than (b) Receiver of continuous inductive 250,000 ohms. Insulation resistance val- automatic cab signal, train stop, or ues between periodic tests shall be not train control device of locomotive less than 250,000 ohms for a continuous equipped with onboard test equipment, inductive automatic cab signal system, shall be maintained with the bottom of automatic train control system, or the receiver at a height above the automatic train stop system, and 20,000 plane of the tops of the rails, and with ohms for an intermittent inductive its outer edge at a horizontal distance automatic train stop system. from the gage side of the nearest rail, [49 FR 3387, Jan. 26, 1984] in accordance with specifications of the carrier. § 236.553 Seal, where required. [49 FR 3387, Jan. 26, 1984] Seal shall be maintained on any de- vice other than brake-pipe cut-out §§ 236.558–236.559 [Reserved] cock (double-heading cock), by means of which the operation of the pneu- § 236.560 Contact element, mechanical matic portion of automatic train-stop trip type; location with respect to or train-control apparatus can be cut rail. out. Contact element of automatic train stop device of the mechanical trip type § 236.554 Rate of pressure reduction; equalizing reservoir or brake pipe. shall be maintained at a height above the plane of the tops of the rails, and The equalizing-reservoir pressure or at a horizontal distance from the gage brake-pipe pressure reduction during side of the rail, in accordance with an automatic brake application shall specifications of the carrier. be at a rate not less than that which results from a manual service applica- [49 FR 3387, Jan. 26, 1984] tion. § 236.561 [Reserved] § 236.555 Repaired or rewound re- ceiver coil. § 236.562 Minimum rail current re- Receiver coil which has been repaired quired. or rewound shall have the same oper- The minimum rail current required ating characteristics which it pos- to restore the locomotive equipment of sessed originally or as currently speci- continuous inductive automatic train fied for new equipment. stop or train control device to normal

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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 § 236.563 Delay time. block signal system is in operation ac- 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 § 236.24 shall take into consideration device is inoperative train may proceed the delay time. at not to exceed 79 miles per hour. § 236.564 Acknowledging time. § 236.568 Difference between speeds Acknowledging time of intermittent authorized by roadway signal and automatic train-stop device shall be cab signal; action required. not more than 30 seconds. If for any reason a cab signal author- izes a speed different from that author- § 236.565 Provision made for pre- venting operation of pneumatic ized by a roadway signal, when a train brake-applying apparatus by dou- enters the block governed by such ble-heading cock; requirement. roadway signal, the lower speed shall Where provision is made for pre- not be exceeded. venting the operation of the pneumatic INSPECTION AND TESTS; ROADWAY brake-applying appartus of an auto- matic train stop or train control device § 236.576 Roadway element. when the double-heading cock is placed Roadway elements, except track cir- in double-heading position, the auto- cuits, including those for test purposes, matic train stop or train control device shall be gaged monthly for height and shall not be cut out before communica- alinement, and shall be tested at least tion is closed between the engineman’s every 6 months. automatic brake valve and the brake pipe, when operating double-heading § 236.577 Test, acknowledgement, and cock toward double-heading position. cut-in circuits. § 236.566 Locomotive of each train op- Test, acknowledgement, and cut-in erating in train stop, train control circuits shall be tested at least once or cab signal territory; equipped. every twelve months. The locomotive from which brakes [49 FR 3387, Jan. 26, 1984] are controlled, of each train operating in automatic train stop, train control, INSPECTION AND TESTS; LOCOMOTIVE or cab signal territory shall be equipped with apparatus responsive to § 236.586 Daily or after trip test. the roadway equipment installed on all (a) Except where tests prescribed by or any part of the route traversed, and § 236.588 are performed at intervals of such apparatus shall be in operative not more than 2 months, each loco- condition. motive equipped with an automatic cab signal or train stop or train control de- § 236.567 Restrictions imposed when vice operating in equipped territory device fails and/or is cut out en shall be inspected for damage to the route. equipment and tested at least once Where an automatic train stop, train each calendar day or within 24 hours control, or cab signal device fails and/ before departure upon each trip. or is cut out enroute, train may pro- (b) Each equipped locomotive shall be ceed at restricted speed or if an auto- tested to determine the locomotive matic block signal system is in oper- equipment is responsive to the wayside ation according to signal indication equipment and shall be cycled to deter- but not to exceed medium speed, to the mine the device functions as intended.

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(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 automatic train stop or non-coded con- the Office of Management and Budget. tinuous inductive automatic train con- trol device shall be tested to determine § 236.588 Periodic test. that the pickup of the device is within Except as provided in § 236.586, peri- specified limits. odic test of the automatic train stop, [49 FR 3387, Jan. 26, 1984] train control, or cab signal apparatus shall be made at least once every 92 § 236.587 Departure test. days, and on multiple-unit cars as spec- (a) The automatic train stop, train ified by the carrier, subject to approval control, or cab signal apparatus on by the FRA. each locomotive, except a locomotive [49 FR 3387, Jan. 26, 1984] or a multiple-unit car equipped with mechanical trip stop, shall be tested § 236.589 Relays. using one of the following methods: (1) Operation over track elements; (a) Each relay shall be removed from (2) Operation over test circuit; service, subjected to thorough test, (3) Use of portable test equipment; or necessary repairs and adjustments (4) Use of onboard test device. made, and shall not be replaced in serv- (b) The test shall be made on depar- ice unless its operating characteristics ture of the locomotive from its initial are in accordance with the limits with- terminal unless that apparatus will be in which such relay is designed to oper- cut out between the initial terminal ate, as follows: and the equipped territory. If the appa- (1) Master or primary relays of ratus is cut out between the initial ter- torque type depending on spring ten- minal and the equipped territory the sion to return contacts to deenergized test shall be made prior to entering position in noncoded continuous induc- equipped territory. tive automatic train stop or train con- (c) If a locomotive makes more than trol system, at least once every two one trip in any 24-hour period, only one years; and departure test is required in such 24- hour period. (2) All other relays, at least once (d)(1) Whoever performs the test shall every six years. certify in writing that such test was (b) [Reserved] 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 § 236.590 Pneumatic apparatus. the certification and test results left at the test location for filing in the office Automatic train stop, train control, of the supervisory official having juris- or cab signal pneumatic apparatus diction. shall be inspected, cleaned, and the re- (2) If it is impractical to leave a copy sults of such inspection recorded as of the certification and test results at provided by § 229.29(a). When a loco- the location of the test, the test results motive with automatic train stop, shall be transmitted to either (i) the train control, or cab signal pneumatic dispatcher or (ii) one other designated apparatus receives out-of-use credit individual at each location, who shall pursuant to § 229.33, the automatic keep a written record of the test re- train stop, train control, or cab signal sults and the name of the person per- apparatus shall be tested in accordance forming the test. These records shall be with § 236.588 prior to the locomotive retained for at least 92 days. being placed in service.

[49 FR 3387, Jan. 26, 1984, as amended at 53 [61 FR 33873, July 1, 1996] FR 37313, Sept. 26, 1988]

EFFECTIVE DATE NOTE: At 49 FR 3387, Jan. 26, 1984, § 236.587 was revised. This section

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