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GP vs SD
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ALL GP's are 4 axle units. GP-9, GP-38-2, GP-60m, etc... <br />ALL SD's are 6 axle units SD-9, SD-40-2, SD79MAC, etc... <br />ALL F's are 4 axle units F-7, F-9, etc... <br />ALL E's are 6 axle units E-8's, etc.... <br />ALL SW's and MP's are 4 axle units. SW-7, SW-1500, MP-1500DC <br />GP's are "General Purpose", SD's are "Special Duty" <br /> <br /> <br />When it comes to GE's.... <br />Anything with a "B" in the model number is 4 axle U23B, B23-7, Dash8-40B, etc... <br />Anything with a "C" is a 6 axle. U30C, C36-7, Dash9-44C, etc... <br /> <br />As has been said by others....the carbody on the six-axle units are generally longer and some of the equipment features located in different places or are shaped differently or are larger than their counter parts.
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