EMD produced 188 SD7s and 471 SD9s spanning a collective production run of just over seven years, from 1952 to 1959. Surprisingly, a handful of these locomotives are still in revenue service ...

the EMD SD9 was a popular locomotive among North American railfans.The EMD SD9 was a 1,750hp six-axle (C-C) diesel road-switcher powered by EMDs highly successful two-stroke 567C V-16 diesel power ...