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I have a question to add on to this I am modeling an intermodal line and plan on running 8-10 double stack cars fully weighted and I plan on using an sd75(athearn)powered unit and an sd40-2 dummy.Now will my single sd75 be enough power I don't have any real grades and am going to use flex track to build 32" radi I have an other sd70 powered and I would like to know if I should use that or if I could pull another dummy unit(sd40-2)Thanks,Dallas
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