Splitting trains is a quite common thing in Germany (though more long distance) and communicated in the official app.
If third party apps don't show that information that's on their part. Usually it's also said after departure inside the train by the conductor, though maybe just on long distance trains.
If third party apps don't show that information that's on their part. Usually it's also said after departure inside the train by the conductor, though maybe just on long distance trains.