I cannot use my self-made Livery on the MP36PH-3C CT (Baby Bullet) Edit: I mean I can't select my creation
The problem might not be just about the loco (and definitely not just Xbox), I have made a variety of Bi-Level mid-cars on PC and in 8 trains I have not seen a single one. I'd be brave enough to say none of the Baby Bullet DLC liveries work.
The player put Xbox because that is the platform they play on and that is where the issue is for them . Unfortunately you can only select one platform instead of an ‘all platforms issue’