49 C.F.R. § 236.3 Locking of signal apparatus housings.
Title 49 - Transportation
Signal apparatus housings shall be secured against unauthorized entry. [49 FR 3382, 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 A—Rules and Instructions: All Systems
General
§ 236.3 Locking of signal apparatus housings.