Just walk in through the doors, no need to press E as the doors are just an image not an object. So just walk through them.

well i mean how you drive them . I dont managed to sit into the seats

once you sit down in the seat you will have access to train controls just click on the big book nearby you to get instructions on how to drive

i got the problem that I cant get in the cotroler seat . I tried it from different distances and location and spam my e button but it dont work . I cant get into the seat

managed to fix this. Had to run a local game instead singleplayer