Excursion Photo stop at Dalecarlia Tunnel 6/6/48

Heading South down the branch, 4320 backs up into the tunnel for a photo line. The switch lead in the foreground leads to a short siding serving the US Army Map Services building behind. Deliveries of paper, mainly. About a hundred yards behind the photographer, the main will cross the DC Transit Glen Echo trolley line, pass the newly constructed chemical unloading facility here at the reservoir, and continue on into Georgetown. Some may recognize this photo; it was used in "Impossible Challenge" (1 and 2) by Herb Harwood. M.S.M.E. Special (B&O), Eng 4320 - 2 psgr + 4 caboose, Dalecarlia Tunnel, Geo'n. Br., 6/6/48, f8 - 1/350"