I am not a US modelling expert, but I have a couple of their sound fitted GP38s, one CSX and one Maryland Midland, which were the first US locos I bought, without realising what they were. They run quite happily on my Lenz DCC system without problems. There are a lot of gimmicks, like classification lights (at least that's what I think they're supposed to be) and radio communication sounds,but they run generally well. I'm not keen on the sounds and would like to have them converted to Loksound, but I don't know if this is possible. I've no idea what sort of Decoder socket they have. Trevor