49 CFR Subpart A - Subpart A—Rules and Instructions: All Systems
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General (§§ 236.1 - 236.18)
- § 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.
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Roadway Signals and Cab Signals (§§ 236.21 - 236.26)
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Track Circuits (§§ 236.51 - 236.60)
- § 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.
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Wires and Cables (§§ 236.71 - 236.76)
- § 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.
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Inspections and Tests; All Systems (§§ 236.101 - 236.110)
- § 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.