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 C — Interlocking236.38749 C.F.R. § 236.387Movable bridge locking.Last amended: 2017Year: 2026Length: 11 wordsOfficial source Cite as 49 C.F.R. § 236.387 (2026)Movable bridge locking shall be tested at least once a year.Previous49 C.F.R. § 236.386