[0.6.1] trains gone wild

[drs9999]

steps to reproduce:
- place a train in front of a station ( so it can stop at the station)
- add the station to the schedule and run the train
- when the train stopped at the station stop the schedule and restart it

-> train will accelerate extrem fast and leave the station does not matter if there is a rail-loop or not

[FrozenOne]

I also encountered this bug in end rail stations, train always speeds up into a dead end, instead of staying at the station or reversing to other stations.

[slpwnd]

Thanks for the report. Trains will not go wild anymore in 0.6.2:)