I am looking to add a couple of engine's to my layout and was looking at the postwar GP20's and SD18's. Both look nice and I was wondering which one has more power, I have 2 dummy's one for each. Looking at ebay I see several of these models that are new or like new. Any suggestions on which one is the better of the 2. Some have dual motors but most have single pullmor, any advice is deeply appreciated.
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