49 C.F.R. § 236.721 Circuit, control.
Title 49 - Transportation
An electrical circuit between a source of electric energy and a device which it operates.
Title 49: Transportation
PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
Subpart G—Definitions
§ 236.721 Circuit, control.