Off Peak Tickets to beyond Newton Abbot have always been accepted on the 1803 to Penzance.
There are
many Off Peak tickets valid on that service, taking that example.
If the gateline staff are unable to check a particular restriction, and the train will shortly depart so there is no time to send them to the ticket office, anything other than letting the passenger through is unacceptable.
The culture - among some staff, by no means all - of 'assume the passenger is not valid' needs to be
eradicated, and if any staff refuse to give the benefit of the doubt, they should be told to find a new job! (I would expect to be told that, if I refused to follow instructions at my workplace, so why are they any different?)
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Or, at the very least, you'd be expected to check with management to see who is right.
Yes, if you thought a colleague was giving you wrong information, you'd check, not assume and refuse to listen!
The culture of making up rules and making assumptions is, while only applicable to a minority, too widespread in the rail industry and I am glad that some people are taking the time to try to get such attitudes removed from gatelines. Some people fear travelling by rail because of the - admittedly small, but very real - possibility of a confrontation with someone who makes up their own rules, sometimes aggressively, and makes threats or denies people travel, and not everyone is able to assert themselves against such individuals. They need to be told to buck their ideas up or work elsewhere, quite frankly.