I am absolutely no expert and realise that others on this forum have great experience and knowledge of the system. But it strikes me that if an operator believes there is a case of fare evasion, it has to be proven, and this would almost certainly mean the passenger being apprehended on a station or a train. Interrogating the ticket purchase history may lead to suspicions but unless you can demonstrate beyond reasonable doubt that fare evasion has taken place, then it hasn’t. How can you be certain that the passenger has made more than those journeys for which he/she has bought a ticket?
I have seen from other posts that the magnetic stripe on tickets only records that the ticket has passed through the barrier, and any previous validations in the barrier are erased. Please correct me if I am wrong, but assuming the ticket opens the barrier, it seems to me to be very difficult to prove attempted fare evasion if the passenger is stopped.
I realise however that e-tickets provide operators with a wealth of data on whether or not they have been reused or any other anomalies.
I have seen from other posts that the magnetic stripe on tickets only records that the ticket has passed through the barrier, and any previous validations in the barrier are erased. Please correct me if I am wrong, but assuming the ticket opens the barrier, it seems to me to be very difficult to prove attempted fare evasion if the passenger is stopped.
I realise however that e-tickets provide operators with a wealth of data on whether or not they have been reused or any other anomalies.