If one has ever been to or seen horseshoe curve,i can tell you NS which is the local railroad is hardly the only roadname that uses this route or the curve,so with only NS branded engines this route will definitely feel abit underwhelming with out any other roadnames included.Plus with skyhook fielding this route i fear it may turn out just as underwhelming as cane creek.This route has ever chance to be great but at this point i'm worried it might be another disappointment.
As we have both CSX and UP locos available one would hope that they sub in and are available to use on the route. It might be an outside Dev doing the route but I honestly think they waste their time putting in yet another version of a loco that's already available on another route.