Train passengers are suffering unfair penalties for minor and often genuine mistakes in buying tickets, an inquiry has found.
The Office of Rail and Road (ORR) said Britain's fare system was "complex" and that rail firms must stop taking "disproportionate action" against travellers.
Sam Williamson, 22, thought he'd bagged a £1.90 discount on a ticket using his young person's rail card, but was threatened with court action - now dropped - as the saving didn't apply before 10am on weekdays outside of July and August.
The Rail Delivery Group, which represents rail firms, said fare evasion costs the industry £400m a year but acknowledged the industry has to be "more consistent".