Title 49

PART 236

Part 236 - Rules, Standards, And Instructions Governing The Installation, Inspection, Maintenance, And Repair Of Signal And Train Control Systems, Devices, And Appliances

PART 236 - RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES Authority:49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461, note; and 49 CFR 1.89. Source:33 FR 19684, Dec. 25, 1968, unless otherwise noted.

49:4.1.1.1.30.0.107.1SECTION 236.0
   236.0 Applicability, minimum requirements, and penalties.
49:4.1.1.1.30.1SUBPART A
Subpart A - Rules and Instructions: All Systems
49:4.1.1.1.30.1.107SUBJGRP 107
   General
49:4.1.1.1.30.1.107.1SECTION 236.1
   236.1 Plans, where kept.
49:4.1.1.1.30.1.107.2SECTION 236.2
   236.2 Grounds.
49:4.1.1.1.30.1.107.3SECTION 236.3
   236.3 Locking of signal apparatus housings.
49:4.1.1.1.30.1.107.4SECTION 236.4
   236.4 Interference with normal functioning of device.
49:4.1.1.1.30.1.107.5SECTION 236.5
   236.5 Design of control circuits on closed circuit principle.
49:4.1.1.1.30.1.107.6SECTION 236.6
   236.6 Hand-operated switch equipped with switch circuit controller.
49:4.1.1.1.30.1.107.7SECTION 236.7
   236.7 Circuit controller operated by switch-and-lock movement.
49:4.1.1.1.30.1.107.8SECTION 236.8
   236.8 Operating characteristics of electromagnetic, electronic, or electrical apparatus.
49:4.1.1.1.30.1.107.9SECTION 236.9
   236.9 Selection of circuits through indicating or annunciating instruments.
49:4.1.1.1.30.1.107.10SECTION 236.10
   236.10 Electric locks, force drop type; where required.
49:4.1.1.1.30.1.107.11SECTION 236.11
   236.11 Adjustment, repair, or replacement of component.
49:4.1.1.1.30.1.107.12SECTION 236.12
   236.12 Spring switch signal protection; where required.
49:4.1.1.1.30.1.107.13SECTION 236.13
   236.13 Spring switch; selection of signal control circuits through circuit controller.
49:4.1.1.1.30.1.107.14SECTION 236.14
   236.14 Spring switch signal protection; requirements.
49:4.1.1.1.30.1.107.15SECTION 236.15
   236.15 Timetable instructions.
49:4.1.1.1.30.1.107.16SECTION 236.16
   236.16 Electric lock, main track releasing circuit.
49:4.1.1.1.30.1.107.17SECTION 236.17
   236.17 Pipe for operating connections, requirements.
49:4.1.1.1.30.1.107.18SECTION 236.18
   236.18 Software management control plan.
49:4.1.1.1.30.1.108SUBJGRP 108
   Roadway Signals and Cab Signals
49:4.1.1.1.30.1.108.19SECTION 236.21
   236.21 Location of roadway signals.
49:4.1.1.1.30.1.108.20SECTION 236.22
   236.22 Semaphore signal arm; clearance to other objects.
49:4.1.1.1.30.1.108.21SECTION 236.23
   236.23 Aspects and indications.
49:4.1.1.1.30.1.108.22SECTION 236.24
   236.24 Spacing of roadway signals.
49:4.1.1.1.30.1.108.23SECTION 236.25
   236.25 [Reserved]
49:4.1.1.1.30.1.108.24SECTION 236.26
   236.26 Buffing device, maintenance.
49:4.1.1.1.30.1.109SUBJGRP 109
   Track Circuits
49:4.1.1.1.30.1.109.25SECTION 236.51
   236.51 Track circuit requirements.
49:4.1.1.1.30.1.109.26SECTION 236.52
   236.52 Relayed cut-section.
49:4.1.1.1.30.1.109.27SECTION 236.53
   236.53 Track circuit feed at grade crossing.
49:4.1.1.1.30.1.109.28SECTION 236.54
   236.54 Minimum length of track circuit.
49:4.1.1.1.30.1.109.29SECTION 236.55
   236.55 Dead section; maximum length.
49:4.1.1.1.30.1.109.30SECTION 236.56
   236.56 Shunting sensitivity.
49:4.1.1.1.30.1.109.31SECTION 236.57
   236.57 Shunt and fouling wires.
49:4.1.1.1.30.1.109.32SECTION 236.58
   236.58 Turnout, fouling section.
49:4.1.1.1.30.1.109.33SECTION 236.59
   236.59 Insulated rail joints.
49:4.1.1.1.30.1.109.34SECTION 236.60
   236.60 Switch shunting circuit; use restricted.
49:4.1.1.1.30.1.110SUBJGRP 110
   Wires and Cables
49:4.1.1.1.30.1.110.35SECTION 236.71
   236.71 Signal wires on pole line and aerial cable.
49:4.1.1.1.30.1.110.36SECTION 236.72
   236.72 [Reserved]
49:4.1.1.1.30.1.110.37SECTION 236.73
   236.73 Open-wire transmission line; clearance to other circuits.
49:4.1.1.1.30.1.110.38SECTION 236.74
   236.74 Protection of insulated wire; splice in underground wire.
49:4.1.1.1.30.1.110.39SECTION 236.75
   236.75 [Reserved]
49:4.1.1.1.30.1.110.40SECTION 236.76
   236.76 Tagging of wires and interference of wires or tags with signal apparatus.
49:4.1.1.1.30.1.111SUBJGRP 111
   Inspections and Tests; All Systems
49:4.1.1.1.30.1.111.41SECTION 236.101
   236.101 Purpose of inspection and tests; removal from service of relay or device failing to meet test requirements.
49:4.1.1.1.30.1.111.42SECTION 236.102
   236.102 Semaphore or searchlight signal mechanism.
49:4.1.1.1.30.1.111.43SECTION 236.103
   236.103 Switch circuit controller or point detector.
49:4.1.1.1.30.1.111.44SECTION 236.104
   236.104 Shunt fouling circuit.
49:4.1.1.1.30.1.111.45SECTION 236.105
   236.105 Electric lock.
49:4.1.1.1.30.1.111.46SECTION 236.106
   236.106 Relays.
49:4.1.1.1.30.1.111.47SECTION 236.107
   236.107 Ground tests.
49:4.1.1.1.30.1.111.48SECTION 236.108
   236.108 Insulation resistance tests, wires in trunking and cables.
49:4.1.1.1.30.1.111.49SECTION 236.109
   236.109 Time releases, timing relays and timing devices.
49:4.1.1.1.30.1.111.50SECTION 236.110
   236.110 Results of tests.
49:4.1.1.1.30.2SUBPART B
Subpart B - Automatic Block Signal Systems
49:4.1.1.1.30.2.112SUBJGRP 112
   Standards
49:4.1.1.1.30.2.112.1SECTION 236.201
   236.201 Track-circuit control of signals.
49:4.1.1.1.30.2.112.2SECTION 236.202
   236.202 Signal governing movements over hand-operated switch.
49:4.1.1.1.30.2.112.3SECTION 236.203
   236.203 Hand operated crossover between main tracks; protection.
49:4.1.1.1.30.2.112.4SECTION 236.204
   236.204 Track signaled for movements in both directions, requirements.
49:4.1.1.1.30.2.112.5SECTION 236.205
   236.205 Signal control circuits; requirements.
49:4.1.1.1.30.2.112.6SECTION 236.206
   236.206 Battery or power supply with respect to relay; location.
49:4.1.1.1.30.2.112.7SECTION 236.207
   236.207 Electric lock on hand-operated switch; control.
49:4.1.1.1.30.3SUBPART C
Subpart C - Interlocking
49:4.1.1.1.30.3.113SUBJGRP 113
   Standards
49:4.1.1.1.30.3.113.1SECTION 236.301
   236.301 Where signals shall be provided.
49:4.1.1.1.30.3.113.2SECTION 236.302
   236.302 Track circuits and route locking.
49:4.1.1.1.30.3.113.3SECTION 236.303
   236.303 Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism.
49:4.1.1.1.30.3.113.4SECTION 236.304
   236.304 Mechanical locking or same protection effected by circuits.
49:4.1.1.1.30.3.113.5SECTION 236.305
   236.305 Approach or time locking.
49:4.1.1.1.30.3.113.6SECTION 236.306
   236.306 Facing point lock or switch-and-lock movement.
49:4.1.1.1.30.3.113.7SECTION 236.307
   236.307 Indication locking.
49:4.1.1.1.30.3.113.8SECTION 236.308
   236.308 Mechanical or electric locking or electric circuits; requisites.
49:4.1.1.1.30.3.113.9SECTION 236.309
   236.309 Loss of shunt protection; where required.
49:4.1.1.1.30.3.113.10SECTION 236.310
   236.310 Signal governing approach to home signal.
49:4.1.1.1.30.3.113.11SECTION 236.311
   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.
49:4.1.1.1.30.3.113.12SECTION 236.312
   236.312 Movable bridge, interlocking of signal appliances with bridge devices.
49:4.1.1.1.30.3.113.13SECTION 236.313
   236.313 [Reserved]
49:4.1.1.1.30.3.113.14SECTION 236.314
   236.314 Electric lock for hand-operated switch or derail.
49:4.1.1.1.30.3.114SUBJGRP 114
   Rules and Instructions
49:4.1.1.1.30.3.114.15SECTION 236.326
   236.326 Mechanical locking removed or disarranged; requirement for permitting train movements through interlocking.
49:4.1.1.1.30.3.114.16SECTION 236.327
   236.327 Switch, movable-point frog or split-point derail.
49:4.1.1.1.30.3.114.17SECTION 236.328
   236.328 Plunger of facing-point lock.
49:4.1.1.1.30.3.114.18SECTION 236.329
   236.329 Bolt lock.
49:4.1.1.1.30.3.114.19SECTION 236.330
   236.330 Locking dog of switch-and-lock movement.
49:4.1.1.1.30.3.114.20SECTION 236.331-236.333
   236.331-236.333 [Reserved]
49:4.1.1.1.30.3.114.21SECTION 236.334
   236.334 Point detector.
49:4.1.1.1.30.3.114.22SECTION 236.335
   236.335 Dogs, stops and trunnions of mechanical locking.
49:4.1.1.1.30.3.114.23SECTION 236.336
   236.336 Locking bed.
49:4.1.1.1.30.3.114.24SECTION 236.337
   236.337 Locking faces of mechanical locking; fit.
49:4.1.1.1.30.3.114.25SECTION 236.338
   236.338 Mechanical locking required in accordance with locking sheet and dog chart.
49:4.1.1.1.30.3.114.26SECTION 236.339
   236.339 Mechanical locking, maintenance requirements.
49:4.1.1.1.30.3.114.27SECTION 236.340
   236.340 Electromechanical interlocking machine; locking between electrical and mechanical levers.
49:4.1.1.1.30.3.114.28SECTION 236.341
   236.341 Latch shoes, rocker links, and quadrants.
49:4.1.1.1.30.3.114.29SECTION 236.342
   236.342 Switch circuit controller.
49:4.1.1.1.30.3.115SUBJGRP 115
   Inspection and Tests
49:4.1.1.1.30.3.115.30SECTION 236.376
   236.376 Mechanical locking.
49:4.1.1.1.30.3.115.31SECTION 236.377
   236.377 Approach locking.
49:4.1.1.1.30.3.115.32SECTION 236.378
   236.378 Time locking.
49:4.1.1.1.30.3.115.33SECTION 236.379
   236.379 Route locking.
49:4.1.1.1.30.3.115.34SECTION 236.380
   236.380 Indication locking.
49:4.1.1.1.30.3.115.35SECTION 236.381
   236.381 Traffic locking.
49:4.1.1.1.30.3.115.36SECTION 236.382
   236.382 Switch obstruction test.
49:4.1.1.1.30.3.115.37SECTION 236.383
   236.383 Valve locks, valves, and valve magnets.
49:4.1.1.1.30.3.115.38SECTION 236.384
   236.384 Cross protection.
49:4.1.1.1.30.3.115.39SECTION 236.385
   236.385 [Reserved]
49:4.1.1.1.30.3.115.40SECTION 236.386
   236.386 Restoring feature on power switches.
49:4.1.1.1.30.3.115.41SECTION 236.387
   236.387 Movable bridge locking.
49:4.1.1.1.30.4SUBPART D
Subpart D - Traffic Control Systems
49:4.1.1.1.30.4.116SUBJGRP 116
   Standards
49:4.1.1.1.30.4.116.1SECTION 236.401
   236.401 Automatic block signal system and interlocking standards applicable to traffic control systems.
49:4.1.1.1.30.4.116.2SECTION 236.402
   236.402 Signals controlled by track circuits and control operator.
49:4.1.1.1.30.4.116.3SECTION 236.403
   236.403 Signals at controlled point.
49:4.1.1.1.30.4.116.4SECTION 236.404
   236.404 Signals at adjacent control points.
49:4.1.1.1.30.4.116.5SECTION 236.405
   236.405 Track signaled for movements in both directions, change of direction of traffic.
49:4.1.1.1.30.4.116.6SECTION 236.406
   236.406 [Reserved]
49:4.1.1.1.30.4.116.7SECTION 236.407
   236.407 Approach or time locking; where required.
49:4.1.1.1.30.4.116.8SECTION 236.408
   236.408 Route locking.
49:4.1.1.1.30.4.116.9SECTION 236.409
   236.409 [Reserved]
49:4.1.1.1.30.4.116.10SECTION 236.410
   236.410 Locking, hand-operated switch; requirements.
49:4.1.1.1.30.4.117SUBJGRP 117
   Rules and Instructions
49:4.1.1.1.30.4.117.11SECTION 236.426
   236.426 Interlocking rules and instructions applicable to traffic control systems.
49:4.1.1.1.30.4.118SUBJGRP 118
   Inspection and Tests
49:4.1.1.1.30.4.118.12SECTION 236.476
   236.476 Interlocking inspections and tests applicable to traffic control systems.
49:4.1.1.1.30.5SUBPART E
Subpart E - Automatic Train Stop, Train Control and Cab Signal Systems
49:4.1.1.1.30.5.119SUBJGRP 119
   Standards
49:4.1.1.1.30.5.119.1SECTION 236.501
   236.501 Forestalling device and speed control.
49:4.1.1.1.30.5.119.2SECTION 236.502
   236.502 Automatic brake application, initiation by restrictive block conditions stopping distance in advance.
49:4.1.1.1.30.5.119.3SECTION 236.503
   236.503 Automatic brake application; initiation when predetermined rate of speed exceeded.
49:4.1.1.1.30.5.119.4SECTION 236.504
   236.504 Operation interconnected with automatic block-signal system.
49:4.1.1.1.30.5.119.5SECTION 236.505
   236.505 Proper operative relation between parts along roadway and parts on locomotive.
49:4.1.1.1.30.5.119.6SECTION 236.506
   236.506 Release of brakes after automatic application.
49:4.1.1.1.30.5.119.7SECTION 236.507
   236.507 Brake application; full service.
49:4.1.1.1.30.5.119.8SECTION 236.508
   236.508 Interference with application of brakes by means of brake valve.
49:4.1.1.1.30.5.119.9SECTION 236.509
   236.509 Two or more locomotives coupled.
49:4.1.1.1.30.5.119.10SECTION 236.510
   236.510 [Reserved]
49:4.1.1.1.30.5.119.11SECTION 236.511
   236.511 Cab signals controlled in accordance with block conditions stopping distance in advance.
49:4.1.1.1.30.5.119.12SECTION 236.512
   236.512 Cab signal indication when locomotive enters block where restrictive conditions obtain.
49:4.1.1.1.30.5.119.13SECTION 236.513
   236.513 Audible indicator.
49:4.1.1.1.30.5.119.14SECTION 236.514
   236.514 Interconnection of cab signal system with roadway signal system.
49:4.1.1.1.30.5.119.15SECTION 236.515
   236.515 Visibility of cab signals.
49:4.1.1.1.30.5.119.16SECTION 236.516
   236.516 Power supply.
49:4.1.1.1.30.5.120SUBJGRP 120
   Rules and Instructions; Roadway
49:4.1.1.1.30.5.120.17SECTION 236.526
   236.526 Roadway element not functioning properly.
49:4.1.1.1.30.5.120.18SECTION 236.527
   236.527 Roadway element insulation resistance.
49:4.1.1.1.30.5.120.19SECTION 236.528
   236.528 Restrictive condition resulting from open hand-operated switch; requirement.
49:4.1.1.1.30.5.120.20SECTION 236.529
   236.529 Roadway element inductor; height and distance from rail.
49:4.1.1.1.30.5.120.21SECTION 236.530
   236.530 [Reserved]
49:4.1.1.1.30.5.120.22SECTION 236.531
   236.531 Trip arm; height and distance from rail.
49:4.1.1.1.30.5.120.23SECTION 236.532
   236.532 Strap iron inductor; use restricted.
49:4.1.1.1.30.5.120.24SECTION 236.533
   236.533 [Reserved]
49:4.1.1.1.30.5.120.25SECTION 236.534
   236.534 Entrance to equipped territory; requirements.
49:4.1.1.1.30.5.121SUBJGRP 121
   Rules and Instructions; Locomotives
49:4.1.1.1.30.5.121.26SECTION 236.551
   236.551 Power supply voltage; requirement.
49:4.1.1.1.30.5.121.27SECTION 236.552
   236.552 Insulation resistance; requirement.
49:4.1.1.1.30.5.121.28SECTION 236.553
   236.553 Seal, where required.
49:4.1.1.1.30.5.121.29SECTION 236.554
   236.554 Rate of pressure reduction; equalizing reservoir or brake pipe.
49:4.1.1.1.30.5.121.30SECTION 236.555
   236.555 Repaired or rewound receiver coil.
49:4.1.1.1.30.5.121.31SECTION 236.556
   236.556 Adjustment of relay.
49:4.1.1.1.30.5.121.32SECTION 236.557
   236.557 Receiver; location with respect to rail.
49:4.1.1.1.30.5.121.33SECTION 236.558-236.559
   236.558-236.559 [Reserved]
49:4.1.1.1.30.5.121.34SECTION 236.560
   236.560 Contact element, mechanical trip type; location with respect to rail.
49:4.1.1.1.30.5.121.35SECTION 236.561
   236.561 [Reserved]
49:4.1.1.1.30.5.121.36SECTION 236.562
   236.562 Minimum rail current required.
49:4.1.1.1.30.5.121.37SECTION 236.563
   236.563 Delay time.
49:4.1.1.1.30.5.121.38SECTION 236.564
   236.564 Acknowledging time.
49:4.1.1.1.30.5.121.39SECTION 236.565
   236.565 Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement.
49:4.1.1.1.30.5.121.40SECTION 236.566
   236.566 Locomotive of each train operating in train stop, train control or cab signal territory; equipped.
49:4.1.1.1.30.5.121.41SECTION 236.567
   236.567 Restrictions imposed when device fails and/or is cut out en route.
49:4.1.1.1.30.5.121.42SECTION 236.568
   236.568 Difference between speeds authorized by roadway signal and cab signal; action required.
49:4.1.1.1.30.5.122SUBJGRP 122
   Inspection and Tests; Roadway
49:4.1.1.1.30.5.122.43SECTION 236.576
   236.576 Roadway element.
49:4.1.1.1.30.5.122.44SECTION 236.577
   236.577 Test, acknowledgement, and cut-in circuits.
49:4.1.1.1.30.5.123SUBJGRP 123
   Inspection and Tests; Locomotive
49:4.1.1.1.30.5.123.45SECTION 236.586
   236.586 Daily or after trip test.
49:4.1.1.1.30.5.123.46SECTION 236.587
   236.587 Departure test.
49:4.1.1.1.30.5.123.47SECTION 236.588
   236.588 Periodic test.
49:4.1.1.1.30.5.123.48SECTION 236.589
   236.589 Relays.
49:4.1.1.1.30.5.123.49SECTION 236.590
   236.590 Pneumatic apparatus.
49:4.1.1.1.30.6SUBPART F
Subpart F - Dragging Equipment and Slide Detectors and Other Similar Protective Devices
49:4.1.1.1.30.6.124SUBJGRP 124
   Standards
49:4.1.1.1.30.6.124.1SECTION 236.601
   236.601 Signals controlled by devices; location.
49:4.1.1.1.30.7SUBPART G
Subpart G - Definitions
49:4.1.1.1.30.7.125.1SECTION 236.700
   236.700 Definitions.
49:4.1.1.1.30.7.125.2SECTION 236.701
   236.701 Application, brake; full service.
49:4.1.1.1.30.7.125.3SECTION 236.702
   236.702 Arm, semaphore.
49:4.1.1.1.30.7.125.4SECTION 236.703
   236.703 Aspect.
49:4.1.1.1.30.7.125.5SECTION 236.704
   236.704 [Reserved]
49:4.1.1.1.30.7.125.6SECTION 236.705
   236.705 Bar, locking.
49:4.1.1.1.30.7.125.7SECTION 236.706
   236.706 Bed, locking.
49:4.1.1.1.30.7.125.8SECTION 236.707
   236.707 Blade, semaphore.
49:4.1.1.1.30.7.125.9SECTION 236.708
   236.708 Block.
49:4.1.1.1.30.7.125.10SECTION 236.709
   236.709 Block, absolute.
49:4.1.1.1.30.7.125.11SECTION 236.710
   236.710 Block, latch.
49:4.1.1.1.30.7.125.12SECTION 236.711
   236.711 Bond, rail joint.
49:4.1.1.1.30.7.125.13SECTION 236.712
   236.712 Brake pipe.
49:4.1.1.1.30.7.125.14SECTION 236.713
   236.713 Bridge, movable.
49:4.1.1.1.30.7.125.15SECTION 236.714
   236.714 Cab.
49:4.1.1.1.30.7.125.16SECTION 236.715-236.716
   236.715-236.716 [Reserved]
49:4.1.1.1.30.7.125.17SECTION 236.717
   236.717 Characteristics, operating.
49:4.1.1.1.30.7.125.18SECTION 236.718
   236.718 Chart, dog.
49:4.1.1.1.30.7.125.19SECTION 236.719
   236.719 Circuit, acknowledgment.
49:4.1.1.1.30.7.125.20SECTION 236.720
   236.720 Circuit, common return.
49:4.1.1.1.30.7.125.21SECTION 236.721
   236.721 Circuit, control.
49:4.1.1.1.30.7.125.22SECTION 236.722
   236.722 Circuit, cut-in.
49:4.1.1.1.30.7.125.23SECTION 236.723
   236.723 Circuit, double wire; line.
49:4.1.1.1.30.7.125.24SECTION 236.724
   236.724 Circuit, shunt fouling.
49:4.1.1.1.30.7.125.25SECTION 236.725
   236.725 Circuit, switch shunting.
49:4.1.1.1.30.7.125.26SECTION 236.726
   236.726 Circuit, track.
49:4.1.1.1.30.7.125.27SECTION 236.727
   236.727 Circuit, track; coded.
49:4.1.1.1.30.7.125.28SECTION 236.728
   236.728 Circuit, trap.
49:4.1.1.1.30.7.125.29SECTION 236.729
   236.729 Cock, double heading.
49:4.1.1.1.30.7.125.30SECTION 236.730
   236.730 Coil, receiver.
49:4.1.1.1.30.7.125.31SECTION 236.731
   236.731 Controller, circuit.
49:4.1.1.1.30.7.125.32SECTION 236.732
   236.732 Controller, circuit; switch.
49:4.1.1.1.30.7.125.33SECTION 236.733
   236.733 Current, foreign.
49:4.1.1.1.30.7.125.34SECTION 236.734
   236.734 Current of traffic.
49:4.1.1.1.30.7.125.35SECTION 236.735
   236.735 Current, leakage.
49:4.1.1.1.30.7.125.36SECTION 236.736
   236.736 Cut-section.
49:4.1.1.1.30.7.125.37SECTION 236.737
   236.737 Cut-section, relayed.
49:4.1.1.1.30.7.125.38SECTION 236.738
   236.738 Detector, point.
49:4.1.1.1.30.7.125.39SECTION 236.739
   236.739 Device, acknowledging.
49:4.1.1.1.30.7.125.40SECTION 236.740
   236.740 Device, reset.
49:4.1.1.1.30.7.125.41SECTION 236.741
   236.741 Distance, stopping.
49:4.1.1.1.30.7.125.42SECTION 236.742
   236.742 Dog, locking.
49:4.1.1.1.30.7.125.43SECTION 236.743
   236.743 Dog, swing.
49:4.1.1.1.30.7.125.44SECTION 236.744
   236.744 Element, roadway.
49:4.1.1.1.30.7.125.45SECTION 236.745
   236.745 Face, locking.
49:4.1.1.1.30.7.125.46SECTION 236.746
   236.746 Feature, restoring.
49:4.1.1.1.30.7.125.47SECTION 236.747
   236.747 Forestall.
49:4.1.1.1.30.7.125.48SECTION 236.748
   236.748 [Reserved]
49:4.1.1.1.30.7.125.49SECTION 236.749
   236.749 Indication.
49:4.1.1.1.30.7.125.50SECTION 236.750
   236.750 Interlocking, automatic.
49:4.1.1.1.30.7.125.51SECTION 236.751
   236.751 Interlocking, manual.
49:4.1.1.1.30.7.125.52SECTION 236.752
   236.752 Joint, rail, insulated.
49:4.1.1.1.30.7.125.53SECTION 236.753
   236.753 Limits, interlocking.
49:4.1.1.1.30.7.125.54SECTION 236.754
   236.754 Line, open wire.
49:4.1.1.1.30.7.125.55SECTION 236.755
   236.755 Link, rocker.
49:4.1.1.1.30.7.125.56SECTION 236.756
   236.756 Lock, bolt.
49:4.1.1.1.30.7.125.57SECTION 236.757
   236.757 Lock, electric.
49:4.1.1.1.30.7.125.58SECTION 236.758
   236.758 Lock, electric, forced drop.
49:4.1.1.1.30.7.125.59SECTION 236.759
   236.759 Lock, facing point.
49:4.1.1.1.30.7.125.60SECTION 236.760
   236.760 Locking, approach.
49:4.1.1.1.30.7.125.61SECTION 236.761
   236.761 Locking, electric.
49:4.1.1.1.30.7.125.62SECTION 236.762
   236.762 Locking, indication.
49:4.1.1.1.30.7.125.63SECTION 236.763
   236.763 Locking, latch operated.
49:4.1.1.1.30.7.125.64SECTION 236.764
   236.764 Locking, lever operated.
49:4.1.1.1.30.7.125.65SECTION 236.765
   236.765 Locking, mechanical.
49:4.1.1.1.30.7.125.66SECTION 236.766
   236.766 Locking, movable bridge.
49:4.1.1.1.30.7.125.67SECTION 236.767
   236.767 Locking, route.
49:4.1.1.1.30.7.125.68SECTION 236.768
   236.768 Locking, time.
49:4.1.1.1.30.7.125.69SECTION 236.769
   236.769 Locking, traffic.
49:4.1.1.1.30.7.125.70SECTION 236.770
   236.770 Locomotive.
49:4.1.1.1.30.7.125.71SECTION 236.771
   236.771 Machine, control.
49:4.1.1.1.30.7.125.72SECTION 236.772
   236.772 Machine, interlocking.
49:4.1.1.1.30.7.125.73SECTION 236.773
   236.773 Movements, conflicting.
49:4.1.1.1.30.7.125.74SECTION 236.774
   236.774 Movement, facing.
49:4.1.1.1.30.7.125.75SECTION 236.775
   236.775 Movement, switch-and-lock.
49:4.1.1.1.30.7.125.76SECTION 236.776
   236.776 Movement, trailing.
49:4.1.1.1.30.7.125.77SECTION 236.777
   236.777 Operator, control.
49:4.1.1.1.30.7.125.78SECTION 236.778
   236.778 Piece, driving.
49:4.1.1.1.30.7.125.79SECTION 236.779
   236.779 Plate, top.
49:4.1.1.1.30.7.125.80SECTION 236.780
   236.780 Plunger, facing point lock.
49:4.1.1.1.30.7.125.81SECTION 236.781
   236.781 [Reserved]
49:4.1.1.1.30.7.125.82SECTION 236.782
   236.782 Point, controlled.
49:4.1.1.1.30.7.125.83SECTION 236.783
   236.783 Point, stop-indication.
49:4.1.1.1.30.7.125.84SECTION 236.784
   236.784 Position, deenergized.
49:4.1.1.1.30.7.125.85SECTION 236.785
   236.785 Position, false restrictive.
49:4.1.1.1.30.7.125.86SECTION 236.786
   236.786 Principle, closed circuit.
49:4.1.1.1.30.7.125.87SECTION 236.787
   236.787 Protection, cross.
49:4.1.1.1.30.7.125.88SECTION 236.787a
   236.787a Railroad.
49:4.1.1.1.30.7.125.89SECTION 236.788
   236.788 Receiver.
49:4.1.1.1.30.7.125.90SECTION 236.789
   236.789 Relay, timing.
49:4.1.1.1.30.7.125.91SECTION 236.790
   236.790 Release, time.
49:4.1.1.1.30.7.125.92SECTION 236.791
   236.791 Release, value.
49:4.1.1.1.30.7.125.93SECTION 236.792
   236.792 Reservoir, equalizing.
49:4.1.1.1.30.7.125.94SECTION 236.793
   236.793 Rod, lock.
49:4.1.1.1.30.7.125.95SECTION 236.794
   236.794 Rod, up-and-down.
49:4.1.1.1.30.7.125.96SECTION 236.795
   236.795 Route.
49:4.1.1.1.30.7.125.97SECTION 236.796
   236.796 Routes, conflicting.
49:4.1.1.1.30.7.125.98SECTION 236.797
   236.797 Route, interlocked.
49:4.1.1.1.30.7.125.99SECTION 236.798
   236.798 Section, dead.
49:4.1.1.1.30.7.125.100SECTION 236.799
   236.799 Section, fouling.
49:4.1.1.1.30.7.125.101SECTION 236.800
   236.800 Sheet, locking.
49:4.1.1.1.30.7.125.102SECTION 236.801
   236.801 Shoe, latch.
49:4.1.1.1.30.7.125.103SECTION 236.802
   236.802 Shunt.
49:4.1.1.1.30.7.125.104SECTION 236.802a
   236.802a Siding.
49:4.1.1.1.30.7.125.105SECTION 236.803
   236.803 Signal, approach.
49:4.1.1.1.30.7.125.106SECTION 236.804
   236.804 Signal, block.
49:4.1.1.1.30.7.125.107SECTION 236.805
   236.805 Signal, cab.
49:4.1.1.1.30.7.125.108SECTION 236.806
   236.806 Signal, home.
49:4.1.1.1.30.7.125.109SECTION 236.807
   236.807 Signal, interlocking.
49:4.1.1.1.30.7.125.110SECTION 236.808
   236.808 Signals, opposing.
49:4.1.1.1.30.7.125.111SECTION 236.809
   236.809 Signal, slotted mechanical.
49:4.1.1.1.30.7.125.112SECTION 236.810
   236.810 Spectacle, semaphore arm.
49:4.1.1.1.30.7.125.113SECTION 236.811
   236.811 Speed, medium.
49:4.1.1.1.30.7.125.114SECTION 236.812
   236.812 Speed, restricted.
49:4.1.1.1.30.7.125.115SECTION 236.813
   236.813 Speed, slow.
49:4.1.1.1.30.7.125.116SECTION 236.813a
   236.813a State, most restrictive.
49:4.1.1.1.30.7.125.117SECTION 236.814
   236.814 Station, control.
49:4.1.1.1.30.7.125.118SECTION 236.815
   236.815 Stop.
49:4.1.1.1.30.7.125.119SECTION 236.816
   236.816 Superiority of trains.
49:4.1.1.1.30.7.125.120SECTION 236.817
   236.817 Switch, electro-pneumatic.
49:4.1.1.1.30.7.125.121SECTION 236.818
   236.818 Switch, facing point.
49:4.1.1.1.30.7.125.122SECTION 236.819
   236.819 Switch, hand operated.
49:4.1.1.1.30.7.125.123SECTION 236.820
   236.820 Switch, interlocked.
49:4.1.1.1.30.7.125.124SECTION 236.820a
   236.820a Switch, power-operated.
49:4.1.1.1.30.7.125.125SECTION 236.821
   236.821 Switch, sectionalizing.
49:4.1.1.1.30.7.125.126SECTION 236.822
   236.822 Switch, spring.
49:4.1.1.1.30.7.125.127SECTION 236.823
   236.823 Switch, trailing point.
49:4.1.1.1.30.7.125.128SECTION 236.824
   236.824 System, automatic block signal.
49:4.1.1.1.30.7.125.129SECTION 236.825
   236.825 System, automatic train control.
49:4.1.1.1.30.7.125.130SECTION 236.826
   236.826 System, automatic train stop.
49:4.1.1.1.30.7.125.131SECTION 236.827
   236.827 System, block signal.
49:4.1.1.1.30.7.125.132SECTION 236.828
   236.828 System, traffic control.
49:4.1.1.1.30.7.125.133SECTION 236.829
   236.829 Terminal, initial.
49:4.1.1.1.30.7.125.134SECTION 236.830
   236.830 Time, acknowledging.
49:4.1.1.1.30.7.125.135SECTION 236.831
   236.831 Time, delay.
49:4.1.1.1.30.7.125.136SECTION 236.831a
   236.831a Track, main.
49:4.1.1.1.30.7.125.137SECTION 236.832
   236.832 Train.
49:4.1.1.1.30.7.125.138SECTION 236.833
   236.833 Train, opposing.
49:4.1.1.1.30.7.125.139SECTION 236.834
   236.834 Trip.
49:4.1.1.1.30.7.125.140SECTION 236.835
   236.835 Trunking.
49:4.1.1.1.30.7.125.141SECTION 236.836
   236.836 Trunnion.
49:4.1.1.1.30.7.125.142SECTION 236.837
   236.837 Valve, electro-pneumatic.
49:4.1.1.1.30.7.125.143SECTION 236.838
   236.838 Wire, shunt.
49:4.1.1.1.30.8SUBPART H
Subpart H - Standards for Processor-Based Signal and Train Control Systems
49:4.1.1.1.30.8.125.1SECTION 236.901
   236.901 Purpose and scope.
49:4.1.1.1.30.8.125.2SECTION 236.903
   236.903 Definitions.
49:4.1.1.1.30.8.125.3SECTION 236.905
   236.905 Railroad Safety Program Plan (RSPP).
49:4.1.1.1.30.8.125.4SECTION 236.907
   236.907 Product Safety Plan (PSP).
49:4.1.1.1.30.8.125.5SECTION 236.909
   236.909 Minimum performance standard.
49:4.1.1.1.30.8.125.6SECTION 236.911
   236.911 Exclusions.
49:4.1.1.1.30.8.125.7SECTION 236.913
   236.913 Filing and approval of PSPs.
49:4.1.1.1.30.8.125.8SECTION 236.915
   236.915 Implementation and operation.
49:4.1.1.1.30.8.125.9SECTION 236.917
   236.917 Retention of records.
49:4.1.1.1.30.8.125.10SECTION 236.919
   236.919 Operations and Maintenance Manual.
49:4.1.1.1.30.8.125.11SECTION 236.921
   236.921 Training and qualification program, general.
49:4.1.1.1.30.8.125.12SECTION 236.923
   236.923 Task analysis and basic requirements.
49:4.1.1.1.30.8.125.13SECTION 236.925
   236.925 Training specific to control office personnel.
49:4.1.1.1.30.8.125.14SECTION 236.927
   236.927 Training specific to locomotive engineers and other operating personnel.
49:4.1.1.1.30.8.125.15SECTION 236.929
   236.929 Training specific to roadway workers.
49:4.1.1.1.30.9SUBPART I
Subpart I - Positive Train Control Systems
49:4.1.1.1.30.9.125.1SECTION 236.1001
   236.1001 Purpose and scope.
49:4.1.1.1.30.9.125.2SECTION 236.1003
   236.1003 Definitions.
49:4.1.1.1.30.9.125.3SECTION 236.1005
   236.1005 Requirements for Positive Train Control systems.
49:4.1.1.1.30.9.125.4SECTION 236.1006
   236.1006 Equipping locomotives operating in PTC territory.
49:4.1.1.1.30.9.125.5SECTION 236.1007
   236.1007 Additional requirements for high-speed service.
49:4.1.1.1.30.9.125.6SECTION 236.1009
   236.1009 Procedural requirements.
49:4.1.1.1.30.9.125.7SECTION 236.1011
   236.1011 PTC Implementation Plan content requirements.
49:4.1.1.1.30.9.125.8SECTION 236.1013
   236.1013 PTC Development Plan and Notice of Product Intent content requirements and Type Approval.
49:4.1.1.1.30.9.125.9SECTION 236.1015
   236.1015 PTC Safety Plan content requirements and PTC System Certification.
49:4.1.1.1.30.9.125.10SECTION 236.1017
   236.1017 Independent third party Verification and Validation.
49:4.1.1.1.30.9.125.11SECTION 236.1019
   236.1019 Main line track exceptions.
49:4.1.1.1.30.9.125.12SECTION 236.1020
   236.1020 [Reserved]
49:4.1.1.1.30.9.125.13SECTION 236.1021
   236.1021 Discontinuances, material modifications, and amendments.
49:4.1.1.1.30.9.125.14SECTION 236.1023
   236.1023 Errors and malfunctions.
49:4.1.1.1.30.9.125.15SECTION 236.1025
   236.1025 [Reserved]
49:4.1.1.1.30.9.125.16SECTION 236.1027
   236.1027 PTC system exclusions.
49:4.1.1.1.30.9.125.17SECTION 236.1029
   236.1029 PTC system use and failures.
49:4.1.1.1.30.9.125.18SECTION 236.1031
   236.1031 Previously approved PTC systems.
49:4.1.1.1.30.9.125.19SECTION 236.1033
   236.1033 Communications and security requirements.
49:4.1.1.1.30.9.125.20SECTION 236.1035
   236.1035 Field testing requirements.
49:4.1.1.1.30.9.125.21SECTION 236.1037
   236.1037 Records retention.
49:4.1.1.1.30.9.125.22SECTION 236.1039
   236.1039 Operations and Maintenance Manual.
49:4.1.1.1.30.9.125.23SECTION 236.1041
   236.1041 Training and qualification program, general.
49:4.1.1.1.30.9.125.24SECTION 236.1043
   236.1043 Task analysis and basic requirements.
49:4.1.1.1.30.9.125.25SECTION 236.1045
   236.1045 Training specific to office control personnel.
49:4.1.1.1.30.9.125.26SECTION 236.1047
   236.1047 Training specific to locomotive engineers and other operating personnel.
49:4.1.1.1.30.9.125.27SECTION 236.1049
   236.1049 Training specific to roadway workers.
49:4.1.1.1.30.10SUBPART 0
49:4.1.1.1.30.11.125.1.64APPENDIX Appendix A
   Appendix A to Part 236 [Reserved]
49:4.1.1.1.30.11.125.1.65APPENDIX Appendix B
   Appendix B to Part 236 - Risk Assessment Criteria
49:4.1.1.1.30.11.125.1.66APPENDIX Appendix C
   Appendix C to Part 236 - Safety Assurance Criteria and Processes
49:4.1.1.1.30.11.125.1.67APPENDIX Appendix D
   Appendix D to Part 236 - Independent Review of Verification and Validation
49:4.1.1.1.30.11.125.1.68APPENDIX Appendix E
   Appendix E to Part 236 - Human-Machine Interface (HMI) Design
49:4.1.1.1.30.11.125.1.69APPENDIX Appendix F
   Appendix F to Part 236 - Minimum Requirements of FRA Directed Independent Third-Party Assessment of PTC System Safety Verification and Validation