D.C. Mun. Regs. tit. 24, r. 24-3105
The clearances prescribed in this chapter shall not apply to engine houses or engine house facilities.
The space between tracks ordinarily used by train and yardmen and other employees as a walkway in the discharge of their duties, and the space beside the tracks within eight feet by six inches (8 ft. x 6 in.) of the center lines of the tracks shall be kept in a reasonably suitable condition for this purpose.
No merchandise, materials, equipment, or other articles shall be placed or permitted to remain either on the ground or on the platforms adjacent to any track at a distance less than eight feet by six inches (8 ft. x 6 in.) from the center line of the track; Provided, that this rule shall not apply to materials to be used within a reasonable time in the construction, maintenance, or repair of tracks.
A white or yellow painted line or other approved type of marker shall be maintained at a distance of not less than eight feet by six inches (8 ft. x 6 in.) from the center line of the track on all platforms, excluding passenger platforms, to indicate the space along the edge of the platform that must be kept clear of merchandise, materials, equipment, or other articles.
The provisions of §§ 3105.3 and 3105.4 shall not apply to platforms used principally in connection with the operation of passenger train equipment on the Washington Terminal Company property and in the Eckington Coach Yard.
On industrial tracks, the responsibility for compliance with §§ 3105.3 and 3105.4 shall rest with the person or persons having control or custody of the warehouse, factory, or other facility served by the affected track.
D.C. Mun. Regs. tit. 24, r. 24-3105