As I've pointed out in the past "realistic" can mean more than fidelity to prototype. Having had a great-uncle who worked for the Minneapolis & St.Louis, I was interested when Athearn Genesis came out with some F units decorated for the M-St.L. However, the price for an A-A or A-B set was something like $220. I ended up buying an A-A set of "blue box" F7's, which Athearn decorated the same as the Genesis ones, for a more "realistic" (for my budget) cost of about $65. I picked up a Genesis F unit powered chassis at a RR flea market for $45 and I'm quite happy with them.