49 C.F.R. § 236.775 Movement, switch-and-lock.
Title 49 - Transportation
A device, the complete operation of which performs the three functions of unlocking, operating and locking a switch, movable-point frog or derail.
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
§ 236.775 Movement, switch-and-lock.