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 G — Definitions236.74549 C.F.R. § 236.745Face, locking.Last amended: 2017Year: 2026Length: 15 wordsOfficial source Cite as 49 C.F.R. § 236.745 (2026)The locking surface of a locking dog, tappet or cross locking of an interlocking machine.Previous49 C.F.R. § 236.744Next49 C.F.R. § 236.746