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Title 49--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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 | 236.0 | Applicability, minimum requirements, and penalties. |
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| 236.1 | Plans, where kept. |
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| 236.2 | Grounds. |
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| 236.3 | Locking of signal apparatus housings. |
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| 236.4 | Interference with normal functioning of device. |
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| 236.5 | Design of control circuits on closed circuit principle. |
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| 236.6 | Hand-operated switch equipped with switch circuit controller. |
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| 236.7 | Circuit controller operated by switch-and-lock movement. |
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| 236.8 | Operating characteristics of electromagnetic, electronic, or electrical apparatus. |
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| 236.9 | Selection of circuits through indicating or annunciating instruments. |
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| 236.10 | Electric locks, force drop type; where required. |
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| 236.11 | Adjustment, repair, or replacement of component. |
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| 236.12 | Spring switch signal protection; where required. |
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| 236.13 | Spring switch; selection of signal control circuits through circuit controller. |
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| 236.14 | Spring switch signal protection; requirements. |
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| 236.15 | Timetable instructions. |
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| 236.16 | Electric lock, main track releasing circuit. |
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| 236.17 | Pipe for operating connections, requirements. |
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| 236.18 | Software management control plan. |
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| 236.21 | Location of roadway signals. |
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| 236.22 | Semaphore signal arm; clearance to other objects. |
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| 236.23 | Aspects and indications. |
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| 236.24 | Spacing of roadway signals. |
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| 236.26 | Buffing device, maintenance. |
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| 236.51 | Track circuit requirements. |
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| 236.52 | Relayed cut-section. |
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| 236.53 | Track circuit feed at grade crossing. |
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| 236.54 | Minimum length of track circuit. |
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| 236.55 | Dead section; maximum length. |
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| 236.56 | Shunting sensitivity. |
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| 236.57 | Shunt and fouling wires. |
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| 236.58 | Turnout, fouling section. |
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| 236.59 | Insulated rail joints. |
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| 236.60 | Switch shunting circuit; use restricted. |
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| 236.71 | Signal wires on pole line and aerial cable. |
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| 236.73 | Open-wire transmission line; clearance to other circuits. |
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| 236.74 | Protection of insulated wire; splice in underground wire. |
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| 236.76 | Tagging of wires and interference of wires or tags with signal apparatus. |
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| 236.101 | Purpose of inspection and tests; removal from service of relay or device failing to meet test requirements. |
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| 236.102 | Semaphore or searchlight signal mechanism. |
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| 236.103 | Switch circuit controller or point detector. |
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| 236.104 | Shunt fouling circuit. |
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| 236.105 | Electric lock. |
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| 236.106 | Relays. |
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| 236.107 | Ground tests. |
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| 236.108 | Insulation resistance tests, wires in trunking and cables. |
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| 236.109 | Time releases, timing relays and timing devices. |
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| 236.110 | Results of tests. |
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| 236.201 | Track-circuit control of signals. |
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| 236.202 | Signal governing movements over hand-operated switch. |
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| 236.203 | Hand operated crossover between main tracks; protection. |
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| 236.204 | Track signaled for movements in both directions, requirements. |
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| 236.205 | Signal control circuits; requirements. |
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| 236.206 | Battery or power supply with respect to relay; location. |
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| 236.207 | Electric lock on hand-operated switch; control. |
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| 236.301 | Where signals shall be provided. |
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| 236.302 | Track circuits and route locking. |
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| 236.303 | Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism. |
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| 236.304 | Mechanical locking or same protection effected by circuits. |
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| 236.305 | Approach or time locking. |
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| 236.306 | Facing point lock or switch-and-lock movement. |
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| 236.307 | Indication locking. |
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| 236.308 | Mechanical or electric locking or electric circuits; requisites. |
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| 236.309 | Loss of shunt protection; where required. |
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| 236.310 | Signal governing approach to home signal. |
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| 236.311 | 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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| 236.312 | Movable bridge, interlocking of signal appliances with bridge devices. |
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| 236.314 | Electric lock for hand-operated switch or derail. |
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| 236.326 | Mechanical locking removed or disarranged; requirement for permitting train movements through interlocking. |
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| 236.327 | Switch, movable-point frog or split-point derail. |
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| 236.328 | Plunger of facing-point lock. |
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| 236.329 | Bolt lock. |
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| 236.330 | Locking dog of switch-and-lock movement. |
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| 236.334 | Point detector. |
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| 236.335 | Dogs, stops and trunnions of mechanical locking. |
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| 236.336 | Locking bed. |
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| 236.337 | Locking faces of mechanical locking; fit. |
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| 236.338 | Mechanical locking required in accordance with locking sheet and dog chart. |
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| 236.339 | Mechanical locking, maintenance requirements. |
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| 236.340 | Electromechanical interlocking machine; locking between electrical and mechanical levers. |
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| 236.341 | Latch shoes, rocker links, and quadrants. |
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| 236.342 | Switch circuit controller. |
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| 236.376 | Mechanical locking. |
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| 236.377 | Approach locking. |
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| 236.378 | Time locking. |
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| 236.379 | Route locking. |
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| 236.380 | Indication locking. |
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| 236.381 | Traffic locking. |
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| 236.382 | Switch obstruction test. |
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| 236.383 | Valve locks, valves, and valve magnets. |
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| 236.384 | Cross protection. |
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| 236.386 | Restoring feature on power switches. |
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| 236.387 | Movable bridge locking. |
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| 236.401 | Automatic block signal system and interlocking standards applicable to traffic control systems. |
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| 236.402 | Signals controlled by track circuits and control operator. |
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| 236.403 | Signals at controlled point. |
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| 236.404 | Signals at adjacent control points. |
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| 236.405 | Track signaled for movements in both directions, change of direction of traffic. |
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| 236.407 | Approach or time locking; where required. |
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| 236.408 | Route locking. |
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| 236.410 | Locking, hand-operated switch; requirements. |
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| 236.426 | Interlocking rules and instructions applicable to traffic control systems. |
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| 236.476 | Interlocking inspections and tests applicable to traffic control systems. |
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| 236.501 | Forestalling device and speed control. |
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| 236.502 | Automatic brake application, initiation by restrictive block conditions stopping distance in advance. |
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| 236.503 | Automatic brake application; initiation when predetermined rate of speed exceeded. |
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| 236.504 | Operation interconnected with automatic block-signal system. |
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| 236.505 | Proper operative relation between parts along roadway and parts on locomotive. |
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| 236.506 | Release of brakes after automatic application. |
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| 236.507 | Brake application; full service. |
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| 236.508 | Interference with application of brakes by means of brake valve. |
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| 236.509 | Two or more locomotives coupled. |
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| 236.511 | Cab signals controlled in accordance with block conditions stopping distance in advance. |
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| 236.512 | Cab signal indication when locomotive enters block where restrictive conditions obtain. |
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| 236.513 | Audible indicator. |
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| 236.514 | Interconnection of cab signal system with roadway signal system. |
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| 236.515 | Visibility of cab signals. |
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| 236.516 | Power supply. |
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| 236.526 | Roadway element not functioning properly. |
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| 236.527 | Roadway element insulation resistance. |
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| 236.528 | Restrictive condition resulting from open hand-operated switch; requirement. |
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| 236.529 | Roadway element inductor; height and distance from rail. |
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| 236.531 | Trip arm; height and distance from rail. |
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| 236.532 | Strap iron inductor; use restricted. |
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| 236.534 | Entrance to equipped territory; requirements. |
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| 236.551 | Power supply voltage; requirement. |
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| 236.552 | Insulation resistance; requirement. |
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| 236.553 | Seal, where required. |
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| 236.554 | Rate of pressure reduction; equalizing reservoir or brake pipe. |
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| 236.555 | Repaired or rewound receiver coil. |
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| 236.556 | Adjustment of relay. |
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| 236.557 | Receiver; location with respect to rail. |
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| 236.560 | Contact element, mechanical trip type; location with respect to rail. |
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| 236.562 | Minimum rail current required. |
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| 236.563 | Delay time. |
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| 236.564 | Acknowledging time. |
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| 236.565 | Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement. |
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| 236.566 | Locomotive of each train operating in train stop, train control or cab signal territory; equipped. |
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| 236.567 | Restrictions imposed when device fails and/or is cut out en route. |
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| 236.568 | Difference between speeds authorized by roadway signal and cab signal; action required. |
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| 236.576 | Roadway element. |
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| 236.577 | Test, acknowledgement, and cut-in circuits. |
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| 236.586 | Daily or after trip test. |
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| 236.587 | Departure test. |
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| 236.588 | Periodic test. |
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| 236.589 | Relays. |
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| 236.590 | Pneumatic apparatus. |
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| 236.601 | Signals controlled by devices; location. |
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| 236.700 | Definitions. |
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| 236.701 | Application, brake; full service. |
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| 236.702 | Arm, semaphore. |
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| 236.703 | Aspect. |
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| 236.705 | Bar, locking. |
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| 236.706 | Bed, locking. |
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| 236.707 | Blade, semaphore. |
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| 236.708 | Block. |
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| 236.709 | Block, absolute. |
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| 236.710 | Block, latch. |
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| 236.711 | Bond, rail joint. |
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| 236.712 | Brake pipe. |
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| 236.713 | Bridge, movable. |
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| 236.714 | Cab. |
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| 236.717 | Characteristics, operating. |
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| 236.718 | Chart, dog. |
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| 236.719 | Circuit, acknowledgment. |
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| 236.720 | Circuit, common return. |
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| 236.721 | Circuit, control. |
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| 236.722 | Circuit, cut-in. |
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| 236.723 | Circuit, double wire; line. |
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| 236.724 | Circuit, shunt fouling. |
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| 236.725 | Circuit, switch shunting. |
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| 236.726 | Circuit, track. |
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| 236.727 | Circuit, track; coded. |
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| 236.728 | Circuit, trap. |
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| 236.729 | Cock, double heading. |
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| 236.730 | Coil, receiver. |
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| 236.731 | Controller, circuit. |
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| 236.732 | Controller, circuit; switch. |
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| 236.733 | Current, foreign. |
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| 236.734 | Current of traffic. |
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| 236.735 | Current, leakage. |
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| 236.736 | Cut-section. |
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| 236.737 | Cut-section, relayed. |
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| 236.738 | Detector, point. |
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| 236.739 | Device, acknowledging. |
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| 236.740 | Device, reset. |
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| 236.741 | Distance, stopping. |
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| 236.742 | Dog, locking. |
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| 236.743 | Dog, swing. |
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| 236.744 | Element, roadway. |
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| 236.745 | Face, locking. |
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| 236.746 | Feature, restoring. |
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| 236.747 | Forestall. |
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| 236.749 | Indication. |
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| 236.750 | Interlocking, automatic. |
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| 236.751 | Interlocking, manual. |
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| 236.752 | Joint, rail, insulated. |
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| 236.753 | Limits, interlocking. |
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| 236.754 | Line, open wire. |
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| 236.755 | Link, rocker. |
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| 236.756 | Lock, bolt. |
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| 236.757 | Lock, electric. |
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| 236.758 | Lock, electric, forced drop. |
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| 236.759 | Lock, facing point. |
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| 236.760 | Locking, approach. |
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| 236.761 | Locking, electric. |
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| 236.762 | Locking, indication. |
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| 236.763 | Locking, latch operated. |
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| 236.764 | Locking, lever operated. |
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| 236.765 | Locking, mechanical. |
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| 236.766 | Locking, movable bridge. |
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| 236.767 | Locking, route. |
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| 236.768 | Locking, time. |
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| 236.769 | Locking, traffic. |
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| 236.770 | Locomotive. |
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| 236.771 | Machine, control. |
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| 236.772 | Machine, interlocking. |
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| 236.773 | Movements, conflicting. |
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| 236.774 | Movement, facing. |
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| 236.775 | Movement, switch-and-lock. |
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| 236.776 | Movement, trailing. |
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| 236.777 | Operator, control. |
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| 236.778 | Piece, driving. |
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| 236.779 | Plate, top. |
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| 236.780 | Plunger, facing point lock. |
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| 236.782 | Point, controlled. |
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| 236.783 | Point, stop-indication. |
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| 236.784 | Position, deenergized. |
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| 236.785 | Position, false restrictive. |
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| 236.786 | Principle, closed circuit. |
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| 236.787 | Protection, cross. |
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| 236.787a | Railroad. |
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| 236.788 | Receiver. |
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| 236.789 | Relay, timing. |
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| 236.790 | Release, time. |
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| 236.791 | Release, value. |
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| 236.792 | Reservoir, equalizing. |
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| 236.793 | Rod, lock. |
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| 236.794 | Rod, up-and-down. |
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| 236.795 | Route. |
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| 236.796 | Routes, conflicting. |
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| 236.797 | Route, interlocked. |
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| 236.798 | Section, dead. |
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| 236.799 | Section, fouling. |
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| 236.800 | Sheet, locking. |
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| 236.801 | Shoe, latch. |
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| 236.802 | Shunt. |
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| 236.802a | Siding. |
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| 236.803 | Signal, approach. |
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| 236.804 | Signal, block. |
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| 236.805 | Signal, cab. |
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| 236.806 | Signal, home. |
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| 236.807 | Signal, interlocking. |
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| 236.808 | Signals, opposing. |
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| 236.809 | Signal, slotted mechanical. |
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| 236.810 | Spectacle, semaphore arm. |
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| 236.811 | Speed, medium. |
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| 236.812 | Speed, restricted. |
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| 236.813 | Speed, slow. |
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| 236.813a | State, most restrictive. |
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| 236.814 | Station, control. |
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| 236.815 | Stop. |
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| 236.816 | Superiority of trains. |
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| 236.817 | Switch, electro-pneumatic. |
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| 236.818 | Switch, facing point. |
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| 236.819 | Switch, hand operated. |
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| 236.820 | Switch, interlocked. |
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| 236.820a | Switch, power-operated. |
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| 236.821 | Switch, sectionalizing. |
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| 236.822 | Switch, spring. |
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| 236.823 | Switch, trailing point. |
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| 236.824 | System, automatic block signal. |
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| 236.825 | System, automatic train control. |
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| 236.826 | System, automatic train stop. |
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| 236.827 | System, block signal. |
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| 236.828 | System, traffic control. |
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| 236.829 | Terminal, initial. |
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| 236.830 | Time, acknowledging. |
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| 236.831 | Time, delay. |
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| 236.831a | Track, main. |
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| 236.832 | Train. |
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| 236.833 | Train, opposing. |
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| 236.834 | Trip. |
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| 236.835 | Trunking. |
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| 236.836 | Trunnion. |
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| 236.837 | Valve, electro-pneumatic. |
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| 236.838 | Wire, shunt. |
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| 236.901 | Purpose and scope. |
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| 236.903 | Definitions. |
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| 236.905 | Railroad Safety Program Plan (RSPP). |
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| 236.907 | Product Safety Plan (PSP). |
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| 236.909 | Minimum performance standard. |
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| 236.911 | Exclusions. |
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| 236.913 | Filing and approval of PSPs. |
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| 236.915 | Implementation and operation. |
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| 236.917 | Retention of records. |
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| 236.919 | Operations and Maintenance Manual. |
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| 236.921 | Training and qualification program, general. |
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| 236.923 | Task analysis and basic requirements. |
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| 236.925 | Training specific to control office personnel. |
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| 236.927 | Training specific to locomotive engineers and other operating personnel. |
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| 236.929 | Training specific to roadway workers. |
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