Code of Federal Regulations > Title 49 > Chapter II > Part 236 > Subpart E - Subpart E—Automatic Train Stop, Train Control and Cab Signal Systems

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 31, 2025

STANDARDS

§ 236.501 - Forestalling device and speed control.

§ 236.502 - Automatic brake application, initiation by restrictive block conditions stopping distance in advance.

§ 236.503 - Automatic brake application; initiation when predetermined rate of speed exceeded.

§ 236.504 - Operation interconnected with automatic block-signal system.

§ 236.505 - Proper operative relation between parts along roadway and parts on locomotive.

§ 236.506 - Release of brakes after automatic application.

§ 236.507 - Brake application; full service.

§ 236.508 - Interference with application of brakes by means of brake valve.

§ 236.509 - Two or more locomotives coupled.

§ 236.510 - [Reserved]

§ 236.511 - Cab signals controlled in accordance with block conditions stopping distance in advance.

§ 236.512 - Cab signal indication when locomotive enters block where restrictive conditions obtain.

§ 236.513 - Audible indicator.

§ 236.514 - Interconnection of cab signal system with roadway signal system.

§ 236.515 - Visibility of cab signals.

§ 236.516 - Power supply.

RULES AND INSTRUCTIONS; ROADWAY

§ 236.526 - Roadway element not functioning properly.

§ 236.527 - Roadway element insulation resistance.

§ 236.528 - Restrictive condition resulting from open hand-operated switch; requirement.

§ 236.529 - Roadway element inductor; height and distance from rail.

§ 236.530 - [Reserved]

§ 236.531 - Trip arm; height and distance from rail.

§ 236.532 - Strap iron inductor; use restricted.

§ 236.533 - [Reserved]

§ 236.534 - Entrance to equipped territory; requirements.

RULES AND INSTRUCTIONS; LOCOMOTIVES

§ 236.551 - Power supply voltage; requirement.

§ 236.552 - Insulation resistance; requirement.

§ 236.553 - Seal, where required.

§ 236.554 - Rate of pressure reduction; equalizing reservoir or brake pipe.

§ 236.555 - Repaired or rewound receiver coil.

§ 236.556 - Adjustment of relay.

§ 236.557 - Receiver; location with respect to rail.

§§ 236.558-236.559 - §[Reserved]

§ 236.560 - Contact element, mechanical trip type; location with respect to rail.

§ 236.561 - [Reserved]

§ 236.562 - Minimum rail current required.

§ 236.563 - Delay time.

§ 236.564 - Acknowledging time.

§ 236.565 - Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement.

§ 236.566 - Locomotive of each train operating in train stop, train control or cab signal territory; equipped.

§ 236.567 - Restrictions imposed when device fails and/or is cut out en route.

§ 236.568 - Difference between speeds authorized by roadway signal and cab signal; action required.

INSPECTION AND TESTS; ROADWAY

§ 236.576 - Roadway element.

§ 236.577 - Test, acknowledgement, and cut-in circuits.

INSPECTION AND TESTS; LOCOMOTIVE

§ 236.586 - Daily or after trip test.

§ 236.587 - Departure test.

§ 236.588 - Periodic test.

§ 236.589 - Relays.

§ 236.590 - Pneumatic apparatus.