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
| WM 7570 |  |
| WM 7571 |  |
| WM 7574 |  |
| WM 7596 |  |
