49 C.F.R. PART 236--RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
TITLE 49--Transportation
Subtitle B--OTHER REGULATIONS RELATING TO TRANSPORTATION
CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
PART 236--RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
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| Applicability, minimum requirements, and penalties.
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Subpart A--RULES AND INSTRUCTIONS: ALL SYSTEMS
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| Locking of signal apparatus housings.
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| Interference with normal functioning of device.
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| Design of control circuits on closed circuit principle.
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| Hand-operated switch equipped with switch circuit controller.
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| Circuit controller operated by switch-and-lock movement.
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| Operating characteristics of electromagnetic, electronic, or electrical apparatus.
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| Selection of circuits through indicating or annunciating instruments.
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| Electric locks, force drop type; where required.
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| Adjustment, repair, or replacement of component.
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| Spring switch signal protection; where required.
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| Spring switch; selection of signal control circuits through circuit controller.
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| Spring switch signal protection; requirements.
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| Electric lock, main track releasing circuit.
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| Pipe for operating connections, requirements.
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| Software management control plan.
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| Location of roadway signals.
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| Semaphore signal arm; clearance to other objects.
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| Spacing of roadway signals.
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| Buffing device, maintenance.
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| Track circuit requirements.
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| Track circuit feed at grade crossing.
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| Minimum length of track circuit.
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| Dead section; maximum length.
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| Turnout, fouling section.
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| Switch shunting circuit; use restricted.
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| Signal wires on pole line and aerial cable.
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| Open-wire transmission line; clearance to other circuits.
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| Protection of insulated wire; splice in underground wire.
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| Tagging of wires and interference of wires or tags with signal apparatus.
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| Purpose of inspection and tests; removal from service of relay or device failing to meet test requirements.
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| Semaphore or searchlight signal mechanism.
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| Switch circuit controller or point detector.
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| Insulation resistance tests, wires in trunking and cables.
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| Time releases, timing relays and timing devices.
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Subpart B--AUTOMATIC BLOCK SIGNAL SYSTEMS
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| Track-circuit control of signals.
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| Signal governing movements over hand-operated switch.
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| Hand operated crossover between main tracks; protection.
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| Track signaled for movements in both directions, requirements.
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| Signal control circuits; requirements.
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| Battery or power supply with respect to relay; location.
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| Electric lock on hand-operated switch; control.
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Subpart C--INTERLOCKING
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| Where signals shall be provided.
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| Track circuits and route locking.
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| Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism.
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| Mechanical locking or same protection effected by circuits.
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| Approach or time locking.
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| Facing point lock or switch-and-lock movement.
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| Mechanical or electric locking or electric circuits; requisites.
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| Loss of shunt protection; where required.
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| Signal governing approach to home signal.
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| Signal control circuits, selection through track relays or devices functioning as track relays and through signal mechanism contacts and time releases at automatic interlocking.
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| Movable bridge, interlocking of signal appliances with bridge devices.
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| Electric lock for hand-operated switch or derail.
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| Mechanical locking removed or disarranged; requirement for permitting train movements through interlocking.
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| Switch, movable-point frog or split-point derail.
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| Plunger of facing-point lock.
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| Locking dog of switch-and-lock movement.
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| Dogs, stops and trunnions of mechanical locking.
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| Locking faces of mechanical locking; fit.
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| Mechanical locking required in accordance with locking sheet and dog chart.
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| Mechanical locking, maintenance requirements.
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| Electromechanical interlocking machine; locking between electrical and mechanical levers.
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| Latch shoes, rocker links, and quadrants.
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| Switch circuit controller.
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| Valve locks, valves, and valve magnets.
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| Restoring feature on power switches.
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Subpart D--TRAFFIC CONTROL SYSTEMS
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| Automatic block signal system and interlocking standards applicable to traffic control systems.
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| Signals controlled by track circuits and control operator.
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| Signals at controlled point.
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| Signals at adjacent control points.
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| Track signaled for movements in both directions, change of direction of traffic.
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| Approach or time locking; where required.
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| Locking, hand-operated switch; requirements.
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| Interlocking rules and instructions applicable to traffic control systems.
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| Interlocking inspections and tests applicable to traffic control systems.
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Subpart E--AUTOMATIC TRAIN STOP, TRAIN CONTROL AND CAB SIGNAL SYSTEMS
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| Forestalling device and speed control.
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| Automatic brake application, initiation by restrictive block conditions stopping distance in advance.
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| Automatic brake application; initiation when predetermined rate of speed exceeded.
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| Operation interconnected with automatic block-signal system.
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| Proper operative relation between parts along roadway and parts on locomotive.
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| Release of brakes after automatic application.
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| Brake application; full service.
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| Interference with application of brakes by means of brake valve.
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| Two or more locomotives coupled.
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| Cab signals controlled in accordance with block conditions stopping distance in advance.
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| Cab signal indication when locomotive enters block where restrictive conditions obtain.
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| Interconnection of cab signal system with roadway signal system.
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| Visibility of cab signals.
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| Roadway element not functioning properly.
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| Roadway element insulation resistance.
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| Restrictive condition resulting from open hand-operated switch; requirement.
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| Roadway element inductor; height and distance from rail.
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| Trip arm; height and distance from rail.
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| Strap iron inductor; use restricted.
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| Entrance to equipped territory; requirements.
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| Power supply voltage; requirement.
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| Insulation resistance; requirement.
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| Rate of pressure reduction; equalizing reservoir or brake pipe.
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| Repaired or rewound receiver coil.
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| Receiver; location with respect to rail.
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| Contact element, mechanical trip type; location with respect to rail.
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| Minimum rail current required.
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| Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement.
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| Locomotive of each train operating in train stop, train control or cab signal territory; equipped.
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| Restrictions imposed when device fails and/or is cut out en route.
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| Difference between speeds authorized by roadway signal and cab signal; action required.
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| Test, acknowledgement, and cut-in circuits.
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| Daily or after trip test.
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Subpart F--DRAGGING EQUIPMENT AND SLIDE DETECTORS AND OTHER SIMILAR PROTECTIVE DEVICES
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| Signals controlled by devices; location.
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Subpart G--DEFINITIONS
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| Application, brake; full service.
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| Characteristics, operating.
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| Circuit, double wire; line.
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| Circuit, switch shunting.
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| Controller, circuit; switch.
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| Lock, electric, forced drop.
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| Movement, switch-and-lock.
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| Plunger, facing point lock.
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| Position, false restrictive.
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| Principle, closed circuit.
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| Signal, slotted mechanical.
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| Spectacle, semaphore arm.
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| Switch, electro-pneumatic.
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| System, automatic block signal.
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| System, automatic train control.
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| System, automatic train stop.
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| Valve, electro-pneumatic.
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Subpart H--STANDARDS FOR PROCESSOR-BASED SIGNAL AND TRAIN CONTROL SYSTEMS
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| Railroad Safety Program Plan (RSPP).
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| Product Safety Plan (PSP).
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| Minimum performance standard.
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| Filing and approval of PSPs.
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| Implementation and operation.
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| Operations and Maintenance Manual.
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| Training and qualification program, general.
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| Task analysis and basic requirements.
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| Training specific to control office personnel.
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| Training specific to locomotive engineers and other operating personnel.
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| Training specific to roadway workers.
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