U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 31, 2025

All TitlesTitle 49Chapter IIPart 236Subpart A - 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.
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