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 — Definitions236.70249 C.F.R. § 236.702Arm, semaphore.Last amended: 2017Year: 2026Length: 18 wordsOfficial source Cite as 49 C.F.R. § 236.702 (2026)The part of a semaphore signal displaying an aspect. It consists of a blade fastened to a spectacle.Previous49 C.F.R. § 236.701Next49 C.F.R. § 236.703