I used to ride in the cab with the "equipping engineer", who don't work on the mainline, but only drives various locomotives between maintenance facilities, or runs tests after repair.
Montana Hi-Line added very detailed diesel shop, which offers possibilities for such kind of scenario.
You can go inside and outside of the shop (shed), use turntable, fuel pumps (not all are operable).
I wish there would be a load test also
https://steamcommunity.com/sharedfiles/ ... 2061347404
