All tickets must be validated (date and time stamped) at the start of your journey (or first journey, in the case of multi-journey tickets).
You validate ('entwerten') your ticket by inserting it in a ticket stamping machine.
You will find these on station platforms and on board buses and trams.
Plain clothes inspectors patrol all forms of local transport and levy on-the-spot fines to anyone found travelling without a validated ticket (known as a ‘Schwarzfahrer’).
On the spot fines are not less than 40 euros. Frequent offenders are fined up to 1,000 euros.
Public transport tickets