Title 49, Part 236 — Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and Appliances

Section 236.0

Applicability, minimum requirements, and penalties.

Section 236.1

Plans, where kept.

Section 236.2

Grounds.

Section 236.3

Locking of signal apparatus housings.

Section 236.4

Interference with normal functioning of device.

Section 236.5

Design of control circuits on closed circuit principle.

Section 236.6

Hand-operated switch equipped with switch circuit controller.

Section 236.7

Circuit controller operated by switch-and-lock movement.

Section 236.8

Operating characteristics of electromagnetic, electronic, or electrical apparatus.

Section 236.9

Selection of circuits through indicating or annunciating instruments.

Section 236.10

Electric locks, force drop type; where required.

Section 236.11

Adjustment, repair, or replacement of component.

Section 236.12

Spring switch signal protection; where required.

Section 236.13

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

Section 236.14

Spring switch signal protection; requirements.

Section 236.15

Timetable instructions.

Section 236.16

Electric lock, main track releasing circuit.

Section 236.17

Pipe for operating connections, requirements.

Section 236.18

Software management control plan.

Section 236.21

Location of roadway signals.

Section 236.22

Semaphore signal arm; clearance to other objects.

Section 236.23

Aspects and indications.

Section 236.24

Spacing of roadway signals.

Section 236.25

[Reserved]

Section 236.26

Buffing device, maintenance.

Section 236.51

Track circuit requirements.

Section 236.52

Relayed cut-section.

Section 236.53

Track circuit feed at grade crossing.

Section 236.54

Minimum length of track circuit.

Section 236.55

Dead section; maximum length.

Section 236.56

Shunting sensitivity.

Section 236.57

Shunt and fouling wires.

Section 236.58

Turnout, fouling section.

Section 236.59

Insulated rail joints.

Section 236.60

Switch shunting circuit; use restricted.

Section 236.71

Signal wires on pole line and aerial cable.

Section 236.72

[Reserved]

Section 236.73

Open-wire transmission line; clearance to other circuits.

Section 236.74

Protection of insulated wire; splice in underground wire.

Section 236.75

[Reserved]

Section 236.76

Tagging of wires and interference of wires or tags with signal apparatus.

Section 236.101

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

Section 236.102

Semaphore or searchlight signal mechanism.

Section 236.103

Switch circuit controller or point detector.

Section 236.104

Shunt fouling circuit.

Section 236.105

Electric lock.

Section 236.106

Relays.

Section 236.107

Ground tests.

Section 236.108

Insulation resistance tests, wires in trunking and cables.

Section 236.109

Time releases, timing relays and timing devices.

Section 236.110

Results of tests.

Section 236.201

Track-circuit control of signals.

Section 236.202

Signal governing movements over hand-operated switch.

Section 236.203

Hand operated crossover between main tracks; protection.

Section 236.204

Track signaled for movements in both directions, requirements.

Section 236.205

Signal control circuits; requirements.

Section 236.206

Battery or power supply with respect to relay; location.

Section 236.207

Electric lock on hand-operated switch; control.

Section 236.301

Where signals shall be provided.

Section 236.302

Track circuits and route locking.

Section 236.303

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

Section 236.304

Mechanical locking or same protection effected by circuits.

Section 236.305

Approach or time locking.

Section 236.306

Facing point lock or switch-and-lock movement.

Section 236.307

Indication locking.

Section 236.308

Mechanical or electric locking or electric circuits; requisites.

Section 236.309

Loss of shunt protection; where required.

Section 236.310

Signal governing approach to home signal.

Section 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.

Section 236.312

Movable bridge, interlocking of signal appliances with bridge devices.

Section 236.313

[Reserved]

Section 236.314

Electric lock for hand-operated switch or derail.

Section 236.326

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

Section 236.327

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

Section 236.328

Plunger of facing-point lock.

Section 236.329

Bolt lock.

Section 236.330

Locking dog of switch-and-lock movement.

Section 236.331-236.333

§§ 236.331-236.333 [Reserved]

Section 236.334

Point detector.

Section 236.335

Dogs, stops and trunnions of mechanical locking.

Section 236.336

Locking bed.

Section 236.337

Locking faces of mechanical locking; fit.

Section 236.338

Mechanical locking required in accordance with locking sheet and dog chart.

Section 236.339

Mechanical locking, maintenance requirements.

Section 236.340

Electromechanical interlocking machine; locking between electrical and mechanical levers.

Section 236.341

Latch shoes, rocker links, and quadrants.

Section 236.342

Switch circuit controller.

Section 236.376

Mechanical locking.

Section 236.377

Approach locking.

Section 236.378

Time locking.

Section 236.379

Route locking.

Section 236.380

Indication locking.

Section 236.381

Traffic locking.

Section 236.382

Switch obstruction test.

Section 236.383

Valve locks, valves, and valve magnets.

Section 236.384

Cross protection.

Section 236.385

[Reserved]

Section 236.386

Restoring feature on power switches.

Section 236.387

Movable bridge locking.

Section 236.401

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

Section 236.402

Signals controlled by track circuits and control operator.

Section 236.403

Signals at controlled point.

Section 236.404

Signals at adjacent control points.

Section 236.405

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

Section 236.406

[Reserved]

Section 236.407

Approach or time locking; where required.

Section 236.408

Route locking.

Section 236.409

[Reserved]

Section 236.410

Locking, hand-operated switch; requirements.

Section 236.426

Interlocking rules and instructions applicable to traffic control systems.

Section 236.476

Interlocking inspections and tests applicable to traffic control systems.

Section 236.501

Forestalling device and speed control.

Section 236.502

Automatic brake application, initiation by restrictive block conditions stopping distance in advance.

Section 236.503

Automatic brake application; initiation when predetermined rate of speed exceeded.

Section 236.504

Operation interconnected with automatic block-signal system.

Section 236.505

Proper operative relation between parts along roadway and parts on locomotive.

Section 236.506

Release of brakes after automatic application.

Section 236.507

Brake application; full service.

Section 236.508

Interference with application of brakes by means of brake valve.

Section 236.509

Two or more locomotives coupled.

Section 236.510

[Reserved]

Section 236.511

Cab signals controlled in accordance with block conditions stopping distance in advance.

Section 236.512

Cab signal indication when locomotive enters block where restrictive conditions obtain.

Section 236.513

Audible indicator.

Section 236.514

Interconnection of cab signal system with roadway signal system.

Section 236.515

Visibility of cab signals.

Section 236.516

Power supply.

Section 236.526

Roadway element not functioning properly.

Section 236.527

Roadway element insulation resistance.

Section 236.528

Restrictive condition resulting from open hand-operated switch; requirement.

Section 236.529

Roadway element inductor; height and distance from rail.

Section 236.530

[Reserved]

Section 236.531

Trip arm; height and distance from rail.

Section 236.532

Strap iron inductor; use restricted.

Section 236.533

[Reserved]

Section 236.534

Entrance to equipped territory; requirements.

Section 236.551

Power supply voltage; requirement.

Section 236.552

Insulation resistance; requirement.

Section 236.553

Seal, where required.

Section 236.554

Rate of pressure reduction; equalizing reservoir or brake pipe.

Section 236.555

Repaired or rewound receiver coil.

Section 236.556

Adjustment of relay.

Section 236.557

Receiver; location with respect to rail.

Section 236.558-236.559

§§ 236.558-236.559 [Reserved]

Section 236.560

Contact element, mechanical trip type; location with respect to rail.

Section 236.561

[Reserved]

Section 236.562

Minimum rail current required.

Section 236.563

Delay time.

Section 236.564

Acknowledging time.

Section 236.565

Provision made for preventing operation of pneumatic brake-applying apparatus by double-heading cock; requirement.

Section 236.566

Locomotive of each train operating in train stop, train control or cab signal territory; equipped.

Section 236.567

Restrictions imposed when device fails and/or is cut out en route.

Section 236.568

Difference between speeds authorized by roadway signal and cab signal; action required.

Section 236.576

Roadway element.

Section 236.577

Test, acknowledgement, and cut-in circuits.

Section 236.586

Daily or after trip test.

Section 236.587

Departure test.

Section 236.588

Periodic test.

Section 236.589

Relays.

Section 236.590

Pneumatic apparatus.

Section 236.601

Signals controlled by devices; location.

Section 236.700

Definitions.

Section 236.701

Application, brake; full service.

Section 236.702

Arm, semaphore.

Section 236.703

Aspect.

Section 236.704

[Reserved]

Section 236.705

Bar, locking.

Section 236.706

Bed, locking.

Section 236.707

Blade, semaphore.

Section 236.708

Block.

Section 236.709

Block, absolute.

Section 236.710

Block, latch.

Section 236.711

Bond, rail joint.

Section 236.712

Brake pipe.

Section 236.713

Bridge, movable.

Section 236.714

Cab.

Section 236.715-236.716

§§ 236.715-236.716 [Reserved]

Section 236.717

Characteristics, operating.

Section 236.718

Chart, dog.

Section 236.719

Circuit, acknowledgment.

Section 236.720

Circuit, common return.

Section 236.721

Circuit, control.

Section 236.722

Circuit, cut-in.

Section 236.723

Circuit, double wire; line.

Section 236.724

Circuit, shunt fouling.

Section 236.725

Circuit, switch shunting.

Section 236.726

Circuit, track.

Section 236.727

Circuit, track; coded.

Section 236.728

Circuit, trap.

Section 236.729

Cock, double heading.

Section 236.730

Coil, receiver.

Section 236.731

Controller, circuit.

Section 236.732

Controller, circuit; switch.

Section 236.733

Current, foreign.

Section 236.734

Current of traffic.

Section 236.735

Current, leakage.

Section 236.736

Cut-section.

Section 236.737

Cut-section, relayed.

Section 236.738

Detector, point.

Section 236.739

Device, acknowledging.

Section 236.740

Device, reset.

Section 236.741

Distance, stopping.

Section 236.742

Dog, locking.

Section 236.743

Dog, swing.

Section 236.744

Element, roadway.

Section 236.745

Face, locking.

Section 236.746

Feature, restoring.

Section 236.747

Forestall.

Section 236.748

[Reserved]

Section 236.749

Indication.

Section 236.750

Interlocking, automatic.

Section 236.751

Interlocking, manual.

Section 236.752

Joint, rail, insulated.

Section 236.753

Limits, interlocking.

Section 236.754

Line, open wire.

Section 236.755

Link, rocker.

Section 236.756

Lock, bolt.

Section 236.757

Lock, electric.

Section 236.758

Lock, electric, forced drop.

Section 236.759

Lock, facing point.

Section 236.760

Locking, approach.

Section 236.761

Locking, electric.

Section 236.762

Locking, indication.

Section 236.763

Locking, latch operated.

Section 236.764

Locking, lever operated.

Section 236.765

Locking, mechanical.

Section 236.766

Locking, movable bridge.

Section 236.767

Locking, route.

Section 236.768

Locking, time.

Section 236.769

Locking, traffic.

Section 236.770

Locomotive.

Section 236.771

Machine, control.

Section 236.772

Machine, interlocking.

Section 236.773

Movements, conflicting.

Section 236.774

Movement, facing.

Section 236.775

Movement, switch-and-lock.

Section 236.776

Movement, trailing.

Section 236.777

Operator, control.

Section 236.778

Piece, driving.

Section 236.779

Plate, top.

Section 236.780

Plunger, facing point lock.

Section 236.781

[Reserved]

Section 236.782

Point, controlled.

Section 236.783

Point, stop-indication.

Section 236.784

Position, deenergized.

Section 236.785

Position, false restrictive.

Section 236.786

Principle, closed circuit.

Section 236.787

Protection, cross.

Section 236.787a

Railroad.

Section 236.788

Receiver.

Section 236.789

Relay, timing.

Section 236.790

Release, time.

Section 236.791

Release, value.

Section 236.792

Reservoir, equalizing.

Section 236.793

Rod, lock.

Section 236.794

Rod, up-and-down.

Section 236.795

Route.

Section 236.796

Routes, conflicting.

Section 236.797

Route, interlocked.

Section 236.798

Section, dead.

Section 236.799

Section, fouling.

Section 236.800

Sheet, locking.

Section 236.801

Shoe, latch.

Section 236.802

Shunt.

Section 236.802a

Siding.

Section 236.803

Signal, approach.

Section 236.804

Signal, block.

Section 236.805

Signal, cab.

Section 236.806

Signal, home.

Section 236.807

Signal, interlocking.

Section 236.808

Signals, opposing.

Section 236.809

Signal, slotted mechanical.

Section 236.810

Spectacle, semaphore arm.

Section 236.811

Speed, medium.

Section 236.812

Speed, restricted.

Section 236.813

Speed, slow.

Section 236.813a

State, most restrictive.

Section 236.814

Station, control.

Section 236.815

Stop.

Section 236.816

Superiority of trains.

Section 236.817

Switch, electro-pneumatic.

Section 236.818

Switch, facing point.

Section 236.819

Switch, hand operated.

Section 236.820

Switch, interlocked.

Section 236.820a

Switch, power-operated.

Section 236.821

Switch, sectionalizing.

Section 236.822

Switch, spring.

Section 236.823

Switch, trailing point.

Section 236.824

System, automatic block signal.

Section 236.825

System, automatic train control.

Section 236.826

System, automatic train stop.

Section 236.827

System, block signal.

Section 236.828

System, traffic control.

Section 236.829

Terminal, initial.

Section 236.830

Time, acknowledging.

Section 236.831

Time, delay.

Section 236.831a

Track, main.

Section 236.832

Train.

Section 236.833

Train, opposing.

Section 236.834

Trip.

Section 236.835

Trunking.

Section 236.836

Trunnion.

Section 236.837

Valve, electro-pneumatic.

Section 236.838

Wire, shunt.

Section 236.901

Purpose and scope.

Section 236.903

Definitions.

Section 236.905

Railroad Safety Program Plan (RSPP).

Section 236.907

Product Safety Plan (PSP).

Section 236.909

Minimum performance standard.

Section 236.911

Exclusions.

Section 236.913

Filing and approval of PSPs.

Section 236.915

Implementation and operation.

Section 236.917

Retention of records.

Section 236.919

Operations and Maintenance Manual.

Section 236.921

Training and qualification program, general.

Section 236.923

Task analysis and basic requirements.

Section 236.925

Training specific to control office personnel.

Section 236.927

Training specific to locomotive engineers and other operating personnel.

Section 236.929

Training specific to roadway workers.

Section 236.1001

Purpose and scope.

Section 236.1003

Definitions.

Section 236.1005

Requirements for Positive Train Control systems.

Section 236.1006

Equipping locomotives operating in PTC territory.

Section 236.1007

Additional requirements for high-speed service.

Section 236.1009

Procedural requirements.

Section 236.1011

PTC Implementation Plan content requirements.

Section 236.1013

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

Section 236.1015

PTC Safety Plan content requirements and PTC System Certification.

Section 236.1017

Independent third party Verification and Validation.

Section 236.1019

Main line track exceptions.

Section 236.1020

[Reserved]

Section 236.1021

Discontinuances, material modifications, and amendments.

Section 236.1023

Errors and malfunctions.

Section 236.1025

[Reserved]

Section 236.1027

PTC system exclusions.

Section 236.1029

PTC system use and failures.

Section 236.1031

Previously approved PTC systems.

Section 236.1033

Communications and security requirements.

Section 236.1035

Field testing requirements.

Section 236.1037

Records retention.

Section 236.1039

Operations and Maintenance Manual.

Section 236.1041

Training and qualification program, general.

Section 236.1043

Task analysis and basic requirements.

Section 236.1045

Training specific to office control personnel.

Section 236.1047

Training specific to locomotive engineers and other operating personnel.

Section 236.1049

Training specific to roadway workers.