49 C.F.R. § 236.386 Restoring feature on power switches.
Title 49 - Transportation
Restoring feature on power switches shall be tested at least once every three months.
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 C—Interlocking
Inspection and Tests
§ 236.386 Restoring feature on power switches.