Washington, DC, has done something remarkable ... The data set (which is available as an interactive map here) covers 125,390 water service lines in the 650,000-person city.

Washington Metro's Green and Yellow lines granted approval to use automated train operation, joining the Red Line.

WASHINGTON (7News ... 7News tagged along with the group, "Transit Enthusiasts of DC." The group rode the Yellow Line for the first time since it reopened and showed up wearing yellow outfits ...

The Washington Metropolitan Area Transit Authority (WMATA) announced Tuesday that its Automatic Train Operation (ATO) is set ...

Nine stories beneath the high-rises along the Southwest Washington waterfront ... among the final steps of a Yellow Line tunnel and bridge reconstruction project that has forced commuters into ...