The train stopped at Rüsselsheim station, the doors opened, people got off or on, I looked at the signal - everything was OK, “Please stand clear of the doors”, a look at the platform, the doors closed, all vehicle displays were OK, I pushed the master controller forward, checking if all the doors were safely closed and if I was not driving too fast or too jerkily, then I looked at the signal again ... A moment of shock, before applying the emergency brake...