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 A — Rules and Instructions: All Systems236.349 C.F.R. § 236.3Locking of signal apparatus housings.Last amended: 2017Year: 2026Length: 15 wordsOfficial source Cite as 49 C.F.R. § 236.3 (2026)Signal apparatus housings shall be secured against unauthorized entry. [49 FR 3382, Jan. 26, 1984]Previous49 C.F.R. § 236.2Next49 C.F.R. § 236.4