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Home Page > Executive Branch > Code of Federal Regulations > Electronic Code of Federal Regulations
e-CFR Data is current as of February 4, 2010
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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Subpart I--XXX
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