49 C.F.R. § 236.551 Power supply voltage; requirement.
Title 49 - Transportation
The voltage of power supply shall be maintained within 10 percent of rated voltage.
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 E—Automatic Train Stop, Train Control and Cab Signal Systems
Rules and Instructions; Locomotives
§ 236.551 Power supply voltage; requirement.