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GP vs SD
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for leewal: you are correct SD does mean Special Duty, ALTHOUGH now-a-days you probally could call SDs Super Duties, because they (and other 6 axle units) handle virtually every mainline, regional, and some short line road jobs. <br />for billchown: the GP15/GP15-1 is an older model, EMD said if the railroads gave them their old GP7s and 9s they would remanufacture them into GP15-1s, not many RRs took this offer though, as only around 300-330 units were produced, the EMD GP15D however is a new model, it uses a CAT prime mover (the work is sub-contracted to Boise Rail (formerly MK)), and last but not least, although not GP15Ds or GP20Ds, the PTRA of Houston owns 24 MK1500Ds which burn diesel fuel, and are essentially the predecessors of GP15Ds and GP20Ds. Wow, I'm gonna take a nap now!
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