When I book a train ticket, the regional trains are already included. My local public transport system (HVV) has online & smart phone ticketing for many many years now.
A regional operator where the ticket can't be bought online or via a smartphone should be really really rare in Germany by now. Which operator is it, which has no online payment option?
A regional operator where the ticket can't be bought online or via a smartphone should be really really rare in Germany by now. Which operator is it, which has no online payment option?