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I have read quite a number of sources which point out that running DC traction motor units with AC units can cause problems. This is due to the difference in performance between the two systems,particularly in reference to acceleration and dynamic breaking in high tonnage,low speed service,where an AC unit can keep lugging where it's DC equivalent will stall. <br /> Norfolk Southern is trying to institute a matched consist policy,with units grouped by horsepower,axle count,and intended service,but not manufacturer and model(i.e SD70s should operate with Dash 9-40CW but not GP38-2). They only have a small number of AC drive locos(SD80MAC,ec-Conrail) which operate in sets,so this isn't as big a concern as for CSX,UP,BNSF,CP who have big fleets of ACs.
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