What about surcharges if the app does not work?

The public transport industry is doing everything it can to ensure that ticket apps and sales systems work without interruption. If this is not guaranteed, this will of course be taken into account at the latest when handling cases in the back office.

There are various options available for purchasing a ticket (analog and digital). Passengers are responsible for ensuring that they have a valid ticket or travel authorization when they depart on public transport, regardless of which channel they select to obtain their travel authorization. It should be noted that the functionality of the device when purchasing e-tickets is the responsibility of the traveler who chooses this form of ticket purchase. Differences have been identified in the reliability / functionality of the various smartphone systems. However, this is the responsibility of the passenger. The purchase process for e-tickets can take longer if network performance is poor. It is best for passengers to make sure that they have a valid e-ticket or travel authorization before boarding public transport.