49 C.F.R. § 236.26 Buffing device, maintenance.
Title 49 - Transportation
Buffing device shall be maintained so as not to cause the signal to display a less restrictive aspect than intended.
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
Roadway Signals and Cab Signals
§ 236.26 Buffing device, maintenance.