I love driving Steam-locs. Unfortunately the BB headlight doesn't work and the HUD information isn't the same as the the technical, Cylinder Cokcs doesn't work and Exhaust/Live-injectors aren't visably adjustable if even adjustable at all; had to use the HUD, to adjust water levels, which indicate a different percentage.
Completion of the CAREER-scenario "Big Boy on Sherman Hill Part 1 CS" is not possible due to AI trains collision at Hermosa. Train UP4774 starts moving on a completely different track as you approach, runs a red signal and then collides with a stationairy AI loco sitting in a sidingin Hermosa.
Unfortunately the BB DLC is really that broken, and my searching on the internet confirmed these issues have been known since 2013....
Dispite all that it's still a fantastic loc to drive, easy to maintain running even at the inclines.