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The Athearn Genesis SD-75 can run at a pretty good clip or faster than proto type while the P2K SD-60s run a bit slower. If you are running them on direct DC, the SD-75 will want to drag or pu***he SD-60 causing motor overheating and wheel drag. If you are installing DCC decoders, you can limit the top end on the SD-75 using a speed table set up so they both perform the same. <br /> <br />Ken, D&J Railroad, Stafford, VA
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