It would be awesome if DTG could add another United States route in. Specifically one on the west coast like Union Pacific, BNSF, or even Montana Rail Link. More specifically the Mullan Pass. This Montana Rail Link operated line stretches from East Helena to Avon. With BNSF connections along the way
The issue with BNSF is they're a little finicky with their licencing, but Union Pacific would be doable I think.
They can do what they did with the Raton Pass for Train simulator, make US version and do a non-US version.