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Western Maryland purchased  12 SD-40s in three orders: 7470-7474 were delivered in black & gold paint in August 1966 as class DS-30, 7495-7596 were delivered in black & gold paint in November 1968 as class DS-31, 7445-7449 were delivered in red, white & black paint in June 1969as class DS-32.  These engines all were all later renumbered by Chessie with the 74xx being changed to 75xx.

Unit Numbers: (highlighted numbers appear on these pages)
7545, 7546, 7547, 7548, 7549, 7570, 7571, 7572, 7573, 7574, 7595, 7596
 

WESTERN MARYLAND 
SD-40 Chessie

WM 7570
WM 7571
WM 7574
WM 7596