Sirenwerks: How does your line get from Rapid City to Billings? West to Gillette, and connections with the CB&Q, or northwest through Montana by way of nowhere notable? Since the Q reached well into the Black Hills, do you have a connection with it, possibly at Deadwood or Lead?
It sounds very similar to the C&NW (DME) line through Wall, which stops just short of the Montana line. It would be interesting to see Sturgis with two railroads and the biker rally...