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 — Definitions236.81049 C.F.R. § 236.810Spectacle, semaphore arm.Last amended: 2017Year: 2026Length: 17 wordsOfficial source Cite as 49 C.F.R. § 236.810 (2026)That part of a semaphore arm which holds the roundels and to which the blade is fastened.Previous49 C.F.R. § 236.809Next49 C.F.R. § 236.811