I suppose what's needed is some sort of equivalent of a caution where the offfender's name is put on a list the first time they infringe rather than fining them.
That would only apply to people travelling with the wrong type of ticket rather than no ticket at all. It should also still be required to pay the difference.
The problem is that a system like that becomes a licence for visiting tourists to try to get away with it as they are unlikely to ever be done again.
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