49 C.F.R. § 234.221 Lamp voltage.
Title 49 - Transportation
The voltage at each lamp shall be maintained at not less than 85 percent of the prescribed rating for the lamp.
Title 49: Transportation
PART 234—GRADE CROSSING SIGNAL SYSTEM SAFETY
Subpart D—Maintenance, Inspection, and Testing
Maintenance Standards
§ 234.221 Lamp voltage.
