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Electronic Code of Federal Regulations

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e-CFR Data is current as of August 26, 2014

Title 49Subtitle BChapter IIPart 236


TITLE 49—Transportation

Subtitle B—OTHER REGULATIONS RELATING TO TRANSPORTATION (CONTINUED)

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

rule
§236.0
Applicability, minimum requirements, and penalties.

Subpart A—RULES AND INSTRUCTIONS: ALL SYSTEMS

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.

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.

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.

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.
rule

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.
rule

Subpart C—INTERLOCKING

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.

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.
§§236.331-236.333
[Reserved]
§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.

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.
rule

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.

Rules and Instructions

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

Inspection and Tests

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

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.

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.

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.
§§236.558-236.559
[Reserved]
§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.

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.
rule

Subpart F—DRAGGING EQUIPMENT AND SLIDE DETECTORS AND OTHER SIMILAR PROTECTIVE DEVICES

Standards

§236.601
Signals controlled by devices; location.
rule

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.
§§236.715-236.716
[Reserved]
§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.
§236.787a
Railroad.
§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.
§236.802a
Siding.
§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.
§236.813a
State, most restrictive.
§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.
§236.820a
Switch, power-operated.
§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.
§236.831a
Track, main.
§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.
rule

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.
rule

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 en route 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
Appendix A to Part 236—Civil Penalties
Appendix
Appendix B to Part 236—Risk Assessment Criteria
Appendix
Appendix C to Part 236—Safety Assurance Criteria and Processes
Appendix
Appendix D to Part 236—Independent Review of Verification and Validation
Appendix
Appendix E to Part 236—Human-Machine Interface (HMI) Design
Appendix
Appendix F to Part 236—Minimum Requirements of FRA Directed Independent Third-Party Assessment of PTC System Safety Verification and Validation


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