With the advent of the first expert loco and TSG saying they are working on at least one more. Maybe its time to show your train number in the info on the left side of the pause screen.
what do you mean the train number? if you mean train class then that is there,BR 101. if you mean the exact loco/ unit number, it is also there, in this case being 101 013-1. if you mean the service number or headcode then to access that you would need to bring up the scedule which is in that menu but on a different page. if you look at the top right it says scedule then click that and it should say it there
press t. it shows the train number on almost every newer timetable. older ones like dresden - riesa that just shows "IC Riesa to Dresden" has the train number already on the coaches PIS