US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter II — FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 236 — RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCESSubpart B — Automatic Block Signal Systems236.20749 C.F.R. § 236.207Electric lock on hand-operated switch; control.Last amended: 2017Year: 2026Length: 40 wordsOfficial source Cite as 49 C.F.R. § 236.207 (2026)Electric lock on hand-operated switch shall be controlled so that it cannot be unlocked until control circuits of signals governing movements over such switch have been opened. Approach or time locking shall be provided. [49 FR 3385, Jan. 26, 1984]Previous49 C.F.R. § 236.206