I'm not that much into diesels, but the GP-7 was the right era, it was Union Pacific, and I love the steam Lionchief Plus locos so much I figured it had to be good. It is more than good. This is another home-run by Lionel. Good sound, great smoke, pulls hard (hardly working here, I think), and it runs -- it runs so smoothly and unusually controllable to small increments of speed.