§ 236.0 - Applicability, minimum requirements, and penalties.

Subpart A - Rules and Instructions: All Systems

Track Circuits

§ 236.51 - Track circuit requirements.

§ 236.52 - Relayed cut-section.

§ 236.53 - Track circuit feed at grade crossing.

§ 236.54 - Minimum length of track circuit.

§ 236.55 - Dead section; maximum length.

§ 236.56 - Shunting sensitivity.

§ 236.57 - Shunt and fouling wires.

§ 236.58 - Turnout, fouling section.

§ 236.59 - Insulated rail joints.

§ 236.60 - Switch shunting circuit; use restricted.

Roadway Signals and Cab Signals

§ 236.21 - Location of roadway signals.

§ 236.22 - Semaphore signal arm; clearance to other objects.

§ 236.23 - Aspects and indications.

§ 236.24 - Spacing of roadway signals.

§ 236.25 - [Reserved]

§ 236.26 - Buffing device, maintenance.

Wires and Cables

§ 236.71 - Signal wires on pole line and aerial cable.

§ 236.72 - [Reserved]

§ 236.73 - Open-wire transmission line; clearance to other circuits.

§ 236.74 - Protection of insulated wire; splice in underground wire.

§ 236.75 - [Reserved]

§ 236.76 - Tagging of wires and interference of wires or tags with signal apparatus.

Inspections and Tests; All Systems

§ 236.101 - Purpose of inspection and tests; removal from service of relay or device failing to meet test requirements.

§ 236.102 - Semaphore or searchlight signal mechanism.

§ 236.103 - Switch circuit controller or point detector.

§ 236.104 - Shunt fouling circuit.

§ 236.105 - Electric lock.

§ 236.106 - Relays.

§ 236.107 - Ground tests.

§ 236.108 - Insulation resistance tests, wires in trunking and cables.

§ 236.109 - Time releases, timing relays and timing devices.

§ 236.110 - Results of tests.

General

§ 236.1 - Plans, where kept.

§ 236.2 - Grounds.

§ 236.3 - Locking of signal apparatus housings.

§ 236.4 - Interference with normal functioning of device.

§ 236.5 - Design of control circuits on closed circuit principle.

§ 236.6 - Hand-operated switch equipped with switch circuit controller.

§ 236.7 - Circuit controller operated by switch-and-lock movement.

§ 236.8 - Operating characteristics of electromagnetic, electronic, or electrical apparatus.

§ 236.9 - Selection of circuits through indicating or annunciating instruments.

§ 236.10 - Electric locks, force drop type; where required.

§ 236.11 - Adjustment, repair, or replacement of component.

§ 236.12 - Spring switch signal protection; where required.

§ 236.13 - Spring switch; selection of signal control circuits through circuit controller.

§ 236.14 - Spring switch signal protection; requirements.

§ 236.15 - Timetable instructions.

§ 236.16 - Electric lock, main track releasing circuit.

§ 236.17 - Pipe for operating connections, requirements.

§ 236.18 - Software management control plan.

Subpart B - Automatic Block Signal Systems

Standards

§ 236.201 - Track-circuit control of signals.

§ 236.202 - Signal governing movements over hand-operated switch.

§ 236.203 - Hand operated crossover between main tracks; protection.

§ 236.204 - Track signaled for movements in both directions, requirements.

§ 236.205 - Signal control circuits; requirements.

§ 236.206 - Battery or power supply with respect to relay; location.

§ 236.207 - Electric lock on hand-operated switch; control.

Subpart C - Interlocking

Rules and Instructions

§ 236.326 - Mechanical locking removed or disarranged; requirement for permitting train movements through interlocking.

§ 236.327 - Switch, movable-point frog or split-point derail.

§ 236.328 - Plunger of facing-point lock.

§ 236.329 - Bolt lock.

§ 236.330 - Locking dog of switch-and-lock movement.

§ 236.334 - Point detector.

§ 236.335 - Dogs, stops and trunnions of mechanical locking.

§ 236.336 - Locking bed.

§ 236.337 - Locking faces of mechanical locking; fit.

§ 236.338 - Mechanical locking required in accordance with locking sheet and dog chart.

§ 236.339 - Mechanical locking, maintenance requirements.

§ 236.340 - Electromechanical interlocking machine; locking between electrical and mechanical levers.

§ 236.341 - Latch shoes, rocker links, and quadrants.

§ 236.342 - Switch circuit controller.

§§ 236.331--236.333 - [Reserved]

Inspection and Tests

§ 236.376 - Mechanical locking.

§ 236.377 - Approach locking.

§ 236.378 - Time locking.

§ 236.379 - Route locking.

§ 236.380 - Indication locking.

§ 236.381 - Traffic locking.

§ 236.382 - Switch obstruction test.

§ 236.383 - Valve locks, valves, and valve magnets.

§ 236.384 - Cross protection.

§ 236.385 - [Reserved]

§ 236.386 - Restoring feature on power switches.

§ 236.387 - Movable bridge locking.

Standards

§ 236.301 - Where signals shall be provided.

§ 236.302 - Track circuits and route locking.

§ 236.303 - Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism.

§ 236.304 - Mechanical locking or same protection effected by circuits.

§ 236.305 - Approach or time locking.

§ 236.306 - Facing point lock or switch-and-lock movement.

§ 236.307 - Indication locking.

§ 236.308 - Mechanical or electric locking or electric circuits; requisites.

§ 236.309 - Loss of shunt protection; where required.

§ 236.310 - Signal governing approach to home signal.

§ 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.

§ 236.312 - Movable bridge, interlocking of signal appliances with bridge devices.

§ 236.313 - [Reserved]

§ 236.314 - Electric lock for hand-operated switch or derail.

Subpart D - Traffic Control Systems

Standards

§ 236.401 - Automatic block signal system and interlocking standards applicable to traffic control systems.

§ 236.402 - Signals controlled by track circuits and control operator.

§ 236.403 - Signals at controlled point.

§ 236.404 - Signals at adjacent control points.

§ 236.405 - Track signaled for movements in both directions, change of direction of traffic.

§ 236.406 - [Reserved]

§ 236.407 - Approach or time locking; where required.

§ 236.408 - Route locking.

§ 236.409 - [Reserved]

§ 236.410 - Locking, hand-operated switch; requirements.

Inspection and Tests

§ 236.476 - Interlocking inspections and tests applicable to traffic control systems.

Rules and Instructions

§ 236.426 - Interlocking rules and instructions applicable to traffic control systems.

Subpart E - Automatic Train Stop, Train Control and Cab Signal Systems

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.

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.

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.

§ 236.560 - 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.

§§ 236.558--236.559 - [Reserved]

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.

Subpart F - Dragging Equipment and Slide Detectors and Other Similar Protective Devices

Standards

§ 236.601 - Signals controlled by devices; location.

Subpart G - Definitions

§ 236.700 - Definitions.

§ 236.701 - Application, brake; full service.

§ 236.702 - Arm, semaphore.

§ 236.703 - Aspect.

§ 236.704 - [Reserved]

§ 236.705 - Bar, locking.

§ 236.706 - Bed, locking.

§ 236.707 - Blade, semaphore.

§ 236.708 - Block.

§ 236.709 - Block, absolute.

§ 236.710 - Block, latch.

§ 236.711 - Bond, rail joint.

§ 236.712 - Brake pipe.

§ 236.713 - Bridge, movable.

§ 236.714 - Cab.

§ 236.717 - Characteristics, operating.

§ 236.718 - Chart, dog.

§ 236.719 - Circuit, acknowledgment.

§ 236.720 - Circuit, common return.

§ 236.721 - Circuit, control.

§ 236.722 - Circuit, cut-in.

§ 236.723 - Circuit, double wire; line.

§ 236.724 - Circuit, shunt fouling.

§ 236.725 - Circuit, switch shunting.

§ 236.726 - Circuit, track.

§ 236.727 - Circuit, track; coded.

§ 236.728 - Circuit, trap.

§ 236.729 - Cock, double heading.

§ 236.730 - Coil, receiver.

§ 236.731 - Controller, circuit.

§ 236.732 - Controller, circuit; switch.

§ 236.733 - Current, foreign.

§ 236.734 - Current of traffic.

§ 236.735 - Current, leakage.

§ 236.736 - Cut-section.

§ 236.737 - Cut-section, relayed.

§ 236.738 - Detector, point.

§ 236.739 - Device, acknowledging.

§ 236.740 - Device, reset.

§ 236.741 - Distance, stopping.

§ 236.742 - Dog, locking.

§ 236.743 - Dog, swing.

§ 236.744 - Element, roadway.

§ 236.745 - Face, locking.

§ 236.746 - Feature, restoring.

§ 236.747 - Forestall.

§ 236.748 - [Reserved]

§ 236.749 - Indication.

§ 236.750 - Interlocking, automatic.

§ 236.751 - Interlocking, manual.

§ 236.752 - Joint, rail, insulated.

§ 236.753 - Limits, interlocking.

§ 236.754 - Line, open wire.

§ 236.755 - Link, rocker.

§ 236.756 - Lock, bolt.

§ 236.757 - Lock, electric.

§ 236.758 - Lock, electric, forced drop.

§ 236.759 - Lock, facing point.

§ 236.760 - Locking, approach.

§ 236.761 - Locking, electric.

§ 236.762 - Locking, indication.

§ 236.763 - Locking, latch operated.

§ 236.764 - Locking, lever operated.

§ 236.765 - Locking, mechanical.

§ 236.766 - Locking, movable bridge.

§ 236.767 - Locking, route.

§ 236.768 - Locking, time.

§ 236.769 - Locking, traffic.

§ 236.770 - Locomotive.

§ 236.771 - Machine, control.

§ 236.772 - Machine, interlocking.

§ 236.773 - Movements, conflicting.

§ 236.774 - Movement, facing.

§ 236.775 - Movement, switch-and-lock.

§ 236.776 - Movement, trailing.

§ 236.777 - Operator, control.

§ 236.778 - Piece, driving.

§ 236.779 - Plate, top.

§ 236.780 - Plunger, facing point lock.

§ 236.781 - [Reserved]

§ 236.782 - Point, controlled.

§ 236.783 - Point, stop-indication.

§ 236.784 - Position, deenergized.

§ 236.785 - Position, false restrictive.

§ 236.786 - Principle, closed circuit.

§ 236.787 - Protection, cross.

§ 236.788 - Receiver.

§ 236.789 - Relay, timing.

§ 236.790 - Release, time.

§ 236.791 - Release, value.

§ 236.792 - Reservoir, equalizing.

§ 236.793 - Rod, lock.

§ 236.794 - Rod, up-and-down.

§ 236.795 - Route.

§ 236.796 - Routes, conflicting.

§ 236.797 - Route, interlocked.

§ 236.798 - Section, dead.

§ 236.799 - Section, fouling.

§ 236.800 - Sheet, locking.

§ 236.801 - Shoe, latch.

§ 236.802 - Shunt.

§ 236.803 - Signal, approach.

§ 236.804 - Signal, block.

§ 236.805 - Signal, cab.

§ 236.806 - Signal, home.

§ 236.807 - Signal, interlocking.

§ 236.808 - Signals, opposing.

§ 236.809 - Signal, slotted mechanical.

§ 236.810 - Spectacle, semaphore arm.

§ 236.811 - Speed, medium.

§ 236.812 - Speed, restricted.

§ 236.813 - Speed, slow.

§ 236.814 - Station, control.

§ 236.815 - Stop.

§ 236.816 - Superiority of trains.

§ 236.817 - Switch, electro-pneumatic.

§ 236.818 - Switch, facing point.

§ 236.819 - Switch, hand operated.

§ 236.820 - Switch, interlocked.

§ 236.821 - Switch, sectionalizing.

§ 236.822 - Switch, spring.

§ 236.823 - Switch, trailing point.

§ 236.824 - System, automatic block signal.

§ 236.825 - System, automatic train control.

§ 236.826 - System, automatic train stop.

§ 236.827 - System, block signal.

§ 236.828 - System, traffic control.

§ 236.829 - Terminal, initial.

§ 236.830 - Time, acknowledging.

§ 236.831 - Time, delay.

§ 236.832 - Train.

§ 236.833 - Train, opposing.

§ 236.834 - Trip.

§ 236.835 - Trunking.

§ 236.836 - Trunnion.

§ 236.837 - Valve, electro-pneumatic.

§ 236.838 - Wire, shunt.

§ 236.820a - Switch, power-operated.

§ 236.831a - Track, main.

§ 236.802a - Siding.

§ 236.813a - State, most restrictive.

§§ 236.715--236.716 - [Reserved]

§ 236.787a - Railroad.

Subpart H - Standards for Processor-Based Signal and Train Control Systems

§ 236.901 - Purpose and scope.

§ 236.903 - Definitions.

§ 236.905 - Railroad Safety Program Plan (RSPP).

§ 236.907 - Product Safety Plan (PSP).

§ 236.909 - Minimum performance standard.

§ 236.911 - Exclusions.

§ 236.913 - Filing and approval of PSPs.

§ 236.915 - Implementation and operation.

§ 236.917 - Retention of records.

§ 236.919 - Operations and Maintenance Manual.

§ 236.921 - Training and qualification program, general.

§ 236.923 - Task analysis and basic requirements.

§ 236.925 - Training specific to control office personnel.

§ 236.927 - Training specific to locomotive engineers and other operating personnel.

§ 236.929 - Training specific to roadway workers.

Subpart I - Positive Train Control Systems

§ 236.1001 - Purpose and scope.

§ 236.1003 - Definitions.

§ 236.1005 - Requirements for Positive Train Control systems.

§ 236.1006 - Equipping locomotives operating in PTC territory.

§ 236.1007 - Additional requirements for high-speed service.

§ 236.1009 - Procedural requirements.

§ 236.1011 - PTC Implementation Plan content requirements.

§ 236.1013 - PTC Development Plan and Notice of Product Intent content requirements and Type Approval.

§ 236.1015 - PTC Safety Plan content requirements and PTC System Certification.

§ 236.1017 - Independent third party Verification and Validation.

§ 236.1019 - Main line track exceptions.

§ 236.1020 - [Reserved]

§ 236.1021 - Discontinuances, material modifications, and amendments.

§ 236.1023 - Errors and malfunctions.

§ 236.1025 - [Reserved]

§ 236.1027 - PTC system exclusions.

§ 236.1029 - PTC system use and failures.

§ 236.1031 - Previously approved PTC systems.

§ 236.1033 - Communications and security requirements.

§ 236.1035 - Field testing requirements.

§ 236.1037 - Records retention.

§ 236.1039 - Operations and Maintenance Manual.

§ 236.1041 - Training and qualification program, general.

§ 236.1043 - Task analysis and basic requirements.

§ 236.1045 - Training specific to office control personnel.

§ 236.1047 - Training specific to locomotive engineers and other operating personnel.

§ 236.1049 - Training specific to roadway workers.

Appendix A to Part 236

Appendix A to Part 236 - Civil Penalties 1, 2

Appendix B to Part 236 - Risk Assessment Criteria

Appendix C to Part 236 - Safety Assurance Criteria and Processes

Appendix D to Part 236 - Independent Review of Verification and Validation

Appendix E to Part 236 - Human-Machine Interface (HMI) Design

Appendix F to Part 236 - Minimum Requirements of FRA Directed Independent Third-Party Assessment of PTC System Safety Verification and Validation