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 — Definitions236.72649 C.F.R. § 236.726Circuit, track.Last amended: 2017Year: 2026Length: 13 wordsOfficial source Cite as 49 C.F.R. § 236.726 (2026)An electrical circuit of which the rails of the track form a part.Previous49 C.F.R. § 236.725Next49 C.F.R. § 236.727