1-> Place your train.
2-> Set trainnumber in the CVL
3-> Get into the cab
4-> Activate cab (F4)
5-> If there is an overhead powerline, set up the pantograph (Ctrl+P). If there is 3rd rail, don't set up pantograph as that would deactivate 3rd pickups.
6-> If you have set the trainnumber in step 2, then you have a path to depart. So press > and depart.
What's the problem?
TWZ = Treinnummer Wijzigen = Change trainnumberBY the way, what is TWZ?