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I live in Pittsburg Kansas and I've noticed that a lot of coal trains are powered by two locomotives up front followed by two in the middle. I've also noticed that the loco's are almost always mixed pairs, one EMD(sd70mac) and one GE(dash9 or newer ac). Why use loco's in the middle and why not pair the same types of loco's? These trains are BNSF and KCS. What types of problems or advantages do mixed locomotives present?
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