US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter II — FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 234 — GRADE CROSSING SAFETYSubpart D — Maintenance, Inspection, and Testing234.22149 C.F.R. § 234.221Lamp voltage.Last amended: 2017Year: 2026Length: 21 wordsOfficial source Cite as 49 C.F.R. § 234.221 (2026)The voltage at each lamp shall be maintained at not less than 85 percent of the prescribed rating for the lamp.Previous49 C.F.R. § 234.219Next49 C.F.R. § 234.223