CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 200–269) > PART 234—GRADE CROSSING SIGNAL SYSTEM SAFETY AND STATE ACTION PLANS > SUBPART D—Maintenance, Inspection, and Testing (§234.201 to §234.275) > 234.253—Flashing light units and lamp voltage.

234.253—Flashing light units and lamp voltage.

(a) Each flashing light unit shall be inspected when installed and at least once every twelve months for proper alignment and frequency of flashes in accordance with installation specifications.
(b) Lamp voltage shall be tested when installed and at least once every 12 months thereafter.
(c) Each flashing light unit shall be inspected for proper visibility, dirt and damage to roundels and reflectors at least once each month.