49 C.F.R. § 236.822 Switch, spring.
Title 49 - Transportation
A switch equipped with a spring device which forces the points to their original position after being trailed through and holds them under spring compression.
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
§ 236.822 Switch, spring.