U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 49Chapter IIPart 236Subpart B - Subpart B—Automatic Block Signal Systems

STANDARDS
§ 236.201 - Track-circuit control of signals.
§ 236.202 - Signal governing movements over hand-operated switch.
§ 236.203 - Hand operated crossover between main tracks; protection.
§ 236.204 - Track signaled for movements in both directions, requirements.
§ 236.205 - Signal control circuits; requirements.
§ 236.206 - Battery or power supply with respect to relay; location.
§ 236.207 - Electric lock on hand-operated switch; control.
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