U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 49Chapter IIPart 236Subpart D - 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.
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