@ManuelFranz: ja habe ich. dieselben, die icke hat. nichts passiert.
It needs to be the original U-Bahn rails from Marcel or Kartoffelphantoms or other U-Bahn track with a third rail at 750V.
If the track used does not have these in the spline file it wont turn on the train:
---------------------------
Paths
---------------------------
[path]
2
0
...
[rail_enh]
...
[third_rail]
...
750
...