This on PC but may apply to other platforms too. On selecting Train 376 to play from the Baby Bullet Journey list, when the run launches you are actually in the cab of an F40... Think this needs to be revised!
I've just tried it & spawned into the mp36, I did have an issue where consists were loading the wrong way round after creating a custom livery but that seems to have gone away after deleting the livery.
You mean this issue ? https://forums.dovetailgames.com/threads/livery-manager-vs-train-content.50669/