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
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§ 236.26 Buffing device, maintenance.
Buffing device shall be maintained so as not to cause the signal to display a less restrictive aspect than intended.