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 — Interlocking236.38649 C.F.R. § 236.386Restoring feature on power switches.Last amended: 2017Year: 2026Length: 14 wordsOfficial source Cite as 49 C.F.R. § 236.386 (2026)Restoring feature on power switches shall be tested at least once every three months.Previous49 C.F.R. § 236.384Next49 C.F.R. § 236.387