49 C.F.R. § 236.577 Test, acknowledgement, and cut-in circuits.
Title 49 - Transportation
Test, acknowledgement, and cut-in circuits shall be tested at least once every twelve months. [49 FR 3387, Jan. 26, 1984]
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 E—Automatic Train Stop, Train Control and Cab Signal Systems
Inspection and Tests; Roadway
§ 236.577 Test, acknowledgement, and cut-in circuits.