Main tracks in center B+O conn. from Wash. Term. to QN Interlocking Tracks in background at loop conn. bet. Q.N. Interlocking and Balt.-Phila. main line. 5/28/35
Q.N. Interlocking, looking East, Wash., D.C. and interlocking at west end of Wye conn. of B+O East + West Lines into Wash. Line diverging to left is loop connection to Balt.-Phila. Route Line to right extends to Union Station. 5/30/35