Having travelled on the 1857 York to Newcastle (TPE) service a few weeks back on a Saturday night, I can confirm that passengers, having been out drinking during the day in York, are more than willing to get very heated over ticketing matters. This concerns an advance ticket, but I can imagine that TOC only tickets will generate a similar response.
Two "gents" were booked on the 1853 VTEC service, and the guard politely explained to them that their ticket was not valid and that they'd have to buy new tickets to Darlington. They rudely refused and started slagging off the guard, calling him a jobsworth, screaming down the carriage blaming the trolley attendant, and as a result, the guard called ahead for BTP at Darlington while getting yelled at and threatened with complaints from the pair of them.
I later emailed TPE and instead commented on how well the guard had dealt with the situation.
As a regular traveller from Newcastle to York and Leeds however, I welcome the fare cut considering that the any permitted day return to York is absolutely insanely priced. That is coming from someone that knows that understands the restrictions, though.
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