Home/CFR/Title 49/Part 236
FEDERAL · 49 CFR

Part 236 — Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and Appliances

346 sections · Title 49: Transportation

§ 236.0Applicability, minimum requirements, and penalties.
§ 236.1Plans, where kept.
§ 236.2Grounds.
§ 236.3Locking of signal apparatus housings.
§ 236.4Interference with normal functioning of device.
§ 236.5Design of control circuits on closed circuit principle.
§ 236.6Hand-operated switch equipped with switch circuit controller.
§ 236.7Circuit controller operated by switch-and-lock movement.
§ 236.8Operating characteristics of electromagnetic, electronic, or electrical apparatus.
§ 236.9Selection of circuits through indicating or annunciating instruments.
§ 236.10Electric locks, force drop type; where required.
§ 236.11Adjustment, repair, or replacement of component.
§ 236.12Spring switch signal protection; where required.
§ 236.13Spring switch; selection of signal control circuits through circuit controller.
§ 236.14Spring switch signal protection; requirements.
§ 236.15Timetable instructions.
§ 236.16Electric lock, main track releasing circuit.
§ 236.17Pipe for operating connections, requirements.
§ 236.18Software management control plan.
§ 236.21Location of roadway signals.
§ 236.22Semaphore signal arm; clearance to other objects.
§ 236.23Aspects and indications.
§ 236.24Spacing of roadway signals.
§ 236.25§ 236.25 [Reserved]
§ 236.26Buffing device, maintenance.
§ 236.51Track circuit requirements.
§ 236.52Relayed cut-section.
§ 236.53Track circuit feed at grade crossing.
§ 236.54Minimum length of track circuit.
§ 236.55Dead section; maximum length.
§ 236.56Shunting sensitivity.
§ 236.57Shunt and fouling wires.
§ 236.58Turnout, fouling section.
§ 236.59Insulated rail joints.
§ 236.60Switch shunting circuit; use restricted.
§ 236.71Signal wires on pole line and aerial cable.
§ 236.72§ 236.72 [Reserved]
§ 236.73Open-wire transmission line; clearance to other circuits.
§ 236.74Protection of insulated wire; splice in underground wire.
§ 236.75§ 236.75 [Reserved]
§ 236.76Tagging of wires and interference of wires or tags with signal apparatus.
§ 236.101Purpose of inspection and tests; removal from service of relay or device failing to meet test requirements.
§ 236.102Semaphore or searchlight signal mechanism.
§ 236.103Switch circuit controller or point detector.
§ 236.104Shunt fouling circuit.
§ 236.105Electric lock.
§ 236.106Relays.
§ 236.107Ground tests.
§ 236.108Insulation resistance tests, wires in trunking and cables.
§ 236.109Time releases, timing relays and timing devices.
§ 236.110Results of tests.
§ 236.201Track-circuit control of signals.
§ 236.202Signal governing movements over hand-operated switch.
§ 236.203Hand operated crossover between main tracks; protection.
§ 236.204Track signaled for movements in both directions, requirements.
§ 236.205Signal control circuits; requirements.
§ 236.206Battery or power supply with respect to relay; location.
§ 236.207Electric lock on hand-operated switch; control.
§ 236.301Where signals shall be provided.
§ 236.302Track circuits and route locking.
§ 236.303Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism.
§ 236.304Mechanical locking or same protection effected by circuits.
§ 236.305Approach or time locking.
§ 236.306Facing point lock or switch-and-lock movement.
§ 236.307Indication locking.
§ 236.308Mechanical or electric locking or electric circuits; requisites.
§ 236.309Loss of shunt protection; where required.
§ 236.310Signal governing approach to home signal.
§ 236.311Signal control circuits, selection through track relays or devices functioning as track relays and through signal mechanism contacts and time releases at automatic interlocking.
§ 236.312Movable bridge, interlocking of signal appliances with bridge devices.
§ 236.313§ 236.313 [Reserved]
§ 236.314Electric lock for hand-operated switch or derail.
§ 236.326Mechanical locking removed or disarranged; requirement for permitting train movements through interlocking.
§ 236.327Switch, movable-point frog or split-point derail.
§ 236.328Plunger of facing-point lock.
§ 236.329Bolt lock.
§ 236.330Locking dog of switch-and-lock movement.
§ 236.331-236.333§§ 236.331-236.333 [Reserved]
§ 236.334Point detector.
§ 236.335Dogs, stops and trunnions of mechanical locking.
§ 236.336Locking bed.
§ 236.337Locking faces of mechanical locking; fit.
§ 236.338Mechanical locking required in accordance with locking sheet and dog chart.
§ 236.339Mechanical locking, maintenance requirements.
§ 236.340Electromechanical interlocking machine; locking between electrical and mechanical levers.
§ 236.341Latch shoes, rocker links, and quadrants.
§ 236.342Switch circuit controller.
§ 236.376Mechanical locking.
§ 236.377Approach locking.
§ 236.378Time locking.
§ 236.379Route locking.
§ 236.380Indication locking.
§ 236.381Traffic locking.
§ 236.382Switch obstruction test.
§ 236.383Valve locks, valves, and valve magnets.
§ 236.384Cross protection.
§ 236.385§ 236.385 [Reserved]
§ 236.386Restoring feature on power switches.
§ 236.387Movable bridge locking.
§ 236.401Automatic block signal system and interlocking standards applicable to traffic control systems.
§ 236.402Signals controlled by track circuits and control operator.
§ 236.403Signals at controlled point.
§ 236.404Signals at adjacent control points.
§ 236.405Track signaled for movements in both directions, change of direction of traffic.
§ 236.406§ 236.406 [Reserved]
§ 236.407Approach or time locking; where required.
§ 236.408Route locking.
§ 236.409§ 236.409 [Reserved]
§ 236.410Locking, hand-operated switch; requirements.
§ 236.426Interlocking rules and instructions applicable to traffic control systems.
§ 236.476Interlocking inspections and tests applicable to traffic control systems.
§ 236.501Forestalling device and speed control.
§ 236.502Automatic brake application, initiation by restrictive block conditions stopping distance in advance.
§ 236.503Automatic brake application; initiation when predetermined rate of speed exceeded.
§ 236.504Operation interconnected with automatic block-signal system.
§ 236.505Proper operative relation between parts along roadway and parts on locomotive.
§ 236.506Release of brakes after automatic application.
§ 236.507Brake application; full service.
§ 236.508Interference with application of brakes by means of brake valve.
§ 236.509Two or more locomotives coupled.
§ 236.510§ 236.510 [Reserved]
§ 236.511Cab signals controlled in accordance with block conditions stopping distance in advance.
§ 236.512Cab signal indication when locomotive enters block where restrictive conditions obtain.
§ 236.513Audible indicator.
§ 236.514Interconnection of cab signal system with roadway signal system.
§ 236.515Visibility of cab signals.
§ 236.516Power supply.
§ 236.526Roadway element not functioning properly.
§ 236.527Roadway element insulation resistance.
§ 236.528Restrictive condition resulting from open hand-operated switch; requirement.
§ 236.529Roadway element inductor; height and distance from rail.
§ 236.530§ 236.530 [Reserved]
§ 236.531Trip arm; height and distance from rail.
§ 236.532Strap iron inductor; use restricted.
§ 236.533§ 236.533 [Reserved]
§ 236.534Entrance to equipped territory; requirements.
§ 236.551Power supply voltage; requirement.
§ 236.552Insulation resistance; requirement.
§ 236.553Seal, where required.
§ 236.554Rate of pressure reduction; equalizing reservoir or brake pipe.
§ 236.555Repaired or rewound receiver coil.
§ 236.556Adjustment of relay.
§ 236.557Receiver; location with respect to rail.
§ 236.558-236.559§§ 236.558-236.559 [Reserved]
§ 236.560Contact element, mechanical trip type; location with respect to rail.
§ 236.561§ 236.561 [Reserved]
§ 236.562Minimum rail current required.
§ 236.563Delay time.
§ 236.564Acknowledging time.
§ 236.565Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement.
§ 236.566Locomotive of each train operating in train stop, train control or cab signal territory; equipped.
§ 236.567Restrictions imposed when device fails and/or is cut out en route.
§ 236.568Difference between speeds authorized by roadway signal and cab signal; action required.
§ 236.576Roadway element.
§ 236.577Test, acknowledgement, and cut-in circuits.
§ 236.586Daily or after trip test.
§ 236.587Departure test.
§ 236.588Periodic test.
§ 236.589Relays.
§ 236.590Pneumatic apparatus.
§ 236.601Signals controlled by devices; location.
§ 236.700Definitions.
§ 236.701Application, brake; full service.
§ 236.702Arm, semaphore.
§ 236.703Aspect.
§ 236.704§ 236.704 [Reserved]
§ 236.705Bar, locking.
§ 236.706Bed, locking.
§ 236.707Blade, semaphore.
§ 236.708Block.
§ 236.709Block, absolute.
§ 236.710Block, latch.
§ 236.711Bond, rail joint.
§ 236.712Brake pipe.
§ 236.713Bridge, movable.
§ 236.714Cab.
§ 236.715-236.716§§ 236.715-236.716 [Reserved]
§ 236.717Characteristics, operating.
§ 236.718Chart, dog.
§ 236.719Circuit, acknowledgment.
§ 236.720Circuit, common return.
§ 236.721Circuit, control.
§ 236.722Circuit, cut-in.
§ 236.723Circuit, double wire; line.
§ 236.724Circuit, shunt fouling.
§ 236.725Circuit, switch shunting.
§ 236.726Circuit, track.
§ 236.727Circuit, track; coded.
§ 236.728Circuit, trap.
§ 236.729Cock, double heading.
§ 236.730Coil, receiver.
§ 236.731Controller, circuit.
§ 236.732Controller, circuit; switch.
§ 236.733Current, foreign.
§ 236.734Current of traffic.
§ 236.735Current, leakage.
§ 236.736Cut-section.
§ 236.737Cut-section, relayed.
§ 236.738Detector, point.
§ 236.739Device, acknowledging.
§ 236.740Device, reset.
§ 236.741Distance, stopping.
§ 236.742Dog, locking.
§ 236.743Dog, swing.
§ 236.744Element, roadway.
§ 236.745Face, locking.
§ 236.746Feature, restoring.
§ 236.747Forestall.
§ 236.748§ 236.748 [Reserved]
§ 236.749Indication.
§ 236.750Interlocking, automatic.
§ 236.751Interlocking, manual.
§ 236.752Joint, rail, insulated.
§ 236.753Limits, interlocking.
§ 236.754Line, open wire.
§ 236.755Link, rocker.
§ 236.756Lock, bolt.
§ 236.757Lock, electric.
§ 236.758Lock, electric, forced drop.
§ 236.759Lock, facing point.
§ 236.760Locking, approach.
§ 236.761Locking, electric.
§ 236.762Locking, indication.
§ 236.763Locking, latch operated.
§ 236.764Locking, lever operated.
§ 236.765Locking, mechanical.
§ 236.766Locking, movable bridge.
§ 236.767Locking, route.
§ 236.768Locking, time.
§ 236.769Locking, traffic.
§ 236.770Locomotive.
§ 236.771Machine, control.
§ 236.772Machine, interlocking.
§ 236.773Movements, conflicting.
§ 236.774Movement, facing.
§ 236.775Movement, switch-and-lock.
§ 236.776Movement, trailing.
§ 236.777Operator, control.
§ 236.778Piece, driving.
§ 236.779Plate, top.
§ 236.780Plunger, facing point lock.
§ 236.781§ 236.781 [Reserved]
§ 236.782Point, controlled.
§ 236.783Point, stop-indication.
§ 236.784Position, deenergized.
§ 236.785Position, false restrictive.
§ 236.786Principle, closed circuit.
§ 236.787Protection, cross.
§ 236.787aRailroad.
§ 236.788Receiver.
§ 236.789Relay, timing.
§ 236.790Release, time.
§ 236.791Release, value.
§ 236.792Reservoir, equalizing.
§ 236.793Rod, lock.
§ 236.794Rod, up-and-down.
§ 236.795Route.
§ 236.796Routes, conflicting.
§ 236.797Route, interlocked.
§ 236.798Section, dead.
§ 236.799Section, fouling.
§ 236.800Sheet, locking.
§ 236.801Shoe, latch.
§ 236.802Shunt.
§ 236.802aSiding.
§ 236.803Signal, approach.
§ 236.804Signal, block.
§ 236.805Signal, cab.
§ 236.806Signal, home.
§ 236.807Signal, interlocking.
§ 236.808Signals, opposing.
§ 236.809Signal, slotted mechanical.
§ 236.810Spectacle, semaphore arm.
§ 236.811Speed, medium.
§ 236.812Speed, restricted.
§ 236.813Speed, slow.
§ 236.813aState, most restrictive.
§ 236.814Station, control.
§ 236.815Stop.
§ 236.816Superiority of trains.
§ 236.817Switch, electro-pneumatic.
§ 236.818Switch, facing point.
§ 236.819Switch, hand operated.
§ 236.820Switch, interlocked.
§ 236.820aSwitch, power-operated.
§ 236.821Switch, sectionalizing.
§ 236.822Switch, spring.
§ 236.823Switch, trailing point.
§ 236.824System, automatic block signal.
§ 236.825System, automatic train control.
§ 236.826System, automatic train stop.
§ 236.827System, block signal.
§ 236.828System, traffic control.
§ 236.829Terminal, initial.
§ 236.830Time, acknowledging.
§ 236.831Time, delay.
§ 236.831aTrack, main.
§ 236.832Train.
§ 236.833Train, opposing.
§ 236.834Trip.
§ 236.835Trunking.
§ 236.836Trunnion.
§ 236.837Valve, electro-pneumatic.
§ 236.838Wire, shunt.
§ 236.901Purpose and scope.
§ 236.903Definitions.
§ 236.905Railroad Safety Program Plan (RSPP).
§ 236.907Product Safety Plan (PSP).
§ 236.909Minimum performance standard.
§ 236.911Exclusions.
§ 236.913Filing and approval of PSPs.
§ 236.915Implementation and operation.
§ 236.917Retention of records.
§ 236.919Operations and Maintenance Manual.
§ 236.921Training and qualification program, general.
§ 236.923Task analysis and basic requirements.
§ 236.925Training specific to control office personnel.
§ 236.927Training specific to locomotive engineers and other operating personnel.
§ 236.929Training specific to roadway workers.
§ 236.1001Purpose and scope.
§ 236.1003Definitions.
§ 236.1005Requirements for Positive Train Control systems.
§ 236.1006Equipping locomotives operating in PTC territory.
§ 236.1007Additional requirements for high-speed service.
§ 236.1009Procedural requirements.
§ 236.1011PTC Implementation Plan content requirements.
§ 236.1013PTC Development Plan and Notice of Product Intent content requirements and Type Approval.
§ 236.1015PTC Safety Plan content requirements and PTC System Certification.
§ 236.1017Independent third party Verification and Validation.
§ 236.1019Main line track exceptions.
§ 236.1020§ 236.1020 [Reserved]
§ 236.1021Discontinuances, material modifications, and amendments.
§ 236.1023Errors and malfunctions.
§ 236.1025§ 236.1025 [Reserved]
§ 236.1027PTC system exclusions.
§ 236.1029PTC system use and failures.
§ 236.1031Previously approved PTC systems.
§ 236.1033Communications and security requirements.
§ 236.1035Field testing requirements.
§ 236.1037Records retention.
§ 236.1039Operations and Maintenance Manual.
§ 236.1041Training and qualification program, general.
§ 236.1043Task analysis and basic requirements.
§ 236.1045Training specific to office control personnel.
§ 236.1047Training specific to locomotive engineers and other operating personnel.
§ 236.1049Training specific to roadway workers.