SD75 Series

From RailroadfanWiki

SD75M

The Electromotive Division SD75M is a 6 axle, 4,300 (or 4,500) HP diesel-electric locomotive built by EMD in 1994. The unit was largely built as a response to GE's 9-44CW model. EMD took the standard 4,000 HP 710 engine used in the SD70's and raised the output to 4,300 HP, in order to more closely compete with the 4,400 HP Dash 9. The SD75M can be distinguished from the SD70M by the large bump on the engineer's side of the locomotive under the forward air intake.

Though it was more powerful than the SD70M, the SD75M was not a very popular model. 76 were built, all for Santa Fe, later going to BNSF, where they remain in service today. Some of Santa Fe's SD75M's were rated at 4,500 HP, but proved to be unreliable at this level of output.

SD75I

The SD75I is a variant of the SD75M built by EMD (by this time EMD production had shifted to the GMD plant in London, Ontario) in the mid 90's. The SD75I used an isolated "whisper cab" separated from the rest of the locomotive by rubber gaskets, instead of the conventional safety cab used on the SD75M.

The SD75I was more successful than the SD75M, with a total of 207 being built. 175 went to Canadian National, 26 went to BNSF, and 6 went to Ontario Northland. Aside from two CN units being wrecked, all remain in service today.

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