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I forgot to check-out. What will happen?

The public transport provider charges a fixed fee (a boarding fare) when you enter a vehicle; € 20,00 when you travel by train and € 4,00 when you travel by tram, subway or bus. When you check-out the system calculates your actual travel costs and they settle this with your boarding fare. If you forget to check-out, they don’t know how far you traveled and they will charge the full boarding fare. You can see it as a fine for not checking out and it is automatically cashed.