D.C. Mun. Regs. tit. 18, § 1699
1699.1 When used in this chapter, the following terms shall have the meaning ascribed:
DDOT – District Department of Transportation
Streetcar – a car other than a railroad train that is operated on rails for the purposes of transporting persons.
Streetcar platform – the public right of way designated for public use as an embarkation/disembarkation or waiting area for the streetcar; the stairways, ramps, and sidewalks that provide direct access to the embarkation/ disembarkation or waiting area; and all equipment and fixtures, including streetcar shelters, in the embarkation/disembarkation or waiting area.
Streetcar guideway – the area where streetcars operate, including the streetcar track, overhead wiring, and the airspace between, above, and surrounding the streetcar tracks through which the streetcar or its appurtenances will pass while operating on the streetcar track. A streetcar guideway includes the concrete slab the tracks are resting on.
SOURCE: Final Rulemaking published at 61 DCR 5419 (May 30, 2014).