I started a new rail line from a station that’s grouped with a bus stop, the game assumed that it is bus line, not a rail line although I selected the ‘rail line’ tab before starting the line.   This resulted in a dysfunctional line that you cannot assign trains to.

It looks like you need to un-group a station before assigning to new line.   This should not be necessary!

This leads me to ask a question; what’s the advantage of grouping stations apart from the convenience of a single name?

disadvantages are numerous

One way to force a train line is to delete the road between the towns, and then if it does not show the train line then you have one of the problems I stated above.

The TrainLine isnt shown correctly thats right in the line overview, but when you assign a Train to the line it will work (then it will be shown as a railroadline as well) as long as the railroadtracks are ok.

greetings Markus

Don’t know if the issue about unable to set the train to line due to grouped station has been fixed. Since the line overview bug hasn’t been fixed yet, I assume this is still the case. My guess is that you accidentally clicked the bus stop/terminal while creating train line, this function is supposed to allow you to select a specific side in a  bus/tram stops group when they’re grouped together automatically because you lay the second stop right on the opposite side of the road. If you don’t select a specific stop, the program automatically designate either stop for the line.