In journey mode (not sure if it's the same in service mode) I was doing chapter 1. I carried out the first three journeys fine, continuing onto the next one at the end of each run but for the fourth run, RE50 10:45 Reisa to Dresden, the train was formed of a 146-dostos-146. It seems like the dosto cab car got subbed out for the 146. Someone else it seems had a similar issue happening with the 143. Link to thread: https://forums.dovetailgames.com/threads/i-have-a-question.45204/#post-372217
I just got this with a 146 and (I think) a 112 on the backend, very very weird. Also drives me slightly nuts that the RE50 run after completing the dosto tutorial doesn't actually have you drive the dosto cab car, it even initially tried to have me drive it in the 112 which I have no idea how to drive.