Industrial Spur Track - B&O/PRR
This spur track appeared to be used for unloading coal hopper cars; the elevation was high enough for a truck to pull under the track.
The picture above shows an abandoned spur in downtown Washington, DC.  It is
elevated, but the connection to the main line has been removed, and it looks
like the land will be re-developed. This photo was taken from inside the
eastbound Amtrak Capitol Limited as it approached the terminal in February,
2002.  This elevated track was one of three or four that branched out for a
couple hundred feet west from the tracks [according to DeLorme and SPV]; both
the Pennsylvania and Baltimore and Ohio RRs used this segment of track.  The
location is just south of Eckington Yard and the Florida Avenue underpass.
 


Thanks to Mike Palmer for the pictures and information on this page.