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Western Maryland purchased 21 GP-9s between May 1954 and June 1957.  These engines were delivered in the black and gold paint scheme and over time 9 units were repainted to the red, white, and black scheme.  All units had their short hood chopped down for better visibility.  Originally numbered 25 to 45 these engines were renumbered as 6400 to 6420 in the Chessie era.

Unit Numbers: (highlighted numbers appear on these pages)
6400, 6401, 6402, 6403, 6404, 6405, 6406, 6407, 6408, 6409,
6410, 6411, 6412, 6413, 6414, 6415, 6416, 6417, 6418, 6419, 6420
 

WESTERN MARYLAND GP-9 Chessie

WM 6402
WM 6403
WM 6405
WM 6407
WM 6408
WM 6412
WM 6413
WM 6415
WM 6416
WM 6417
WM 6418
WM 6419