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 — Definitions236.81149 C.F.R. § 236.811Speed, medium.Last amended: 2017Year: 2026Length: 8 wordsOfficial source Cite as 49 C.F.R. § 236.811 (2026)A speed not exceeding 40 miles per hour.Previous49 C.F.R. § 236.810Next49 C.F.R. § 236.812