> "Apparently we were not registered at Troisdorf station, so we are on the wrong tracks"
Many stations have a 4 track system: a left track and right track which are adjacent to platforms, and 2 tracks in the middle, which are designed for non-stopping trains.If the train was on the middle track, stopping would introduce risk and disruption by slowing/stopping the other trains travelling on the high-speed non-stopping line, and also endanger passengers who would have to dismount at height from the train onto an active track, cross the active track, and climb up to the platform.
Once the train was routed onto the incorrect track, correcting it was likely to be impractical (infrequent track transfer points) and stopping on the high-speed track would would be excessively disruptive and dangerous.
They simply told me: this behavior ought to be punished. Which is a euphemism for but I'm not going to do it. They didn't want the hassle of potentially dealing with one out of many students filing a complaint or worst-case go to Karlsruhe (Germans know what that means). Which is exemplary of German bureaucracy, nobody wants to make decisions and carry responsibility.
I love Germany, but this is really something they need to fix going forward, because it stifles society and the economy in many ways.