Dude. Airlines aren't railways. It's not the same thing so don't even try to compare it. Fact is, you can just jump on a train most of the time without having to make any advance bookings.
Rail staff are there to help out in the same way that police who get free travel are there to help out in the event of an incident.
I've been travelling PRIV on Chiltern before when an incident arose - it saw me spending my entire journey from Brum to London with a torch pointed down the gangway of one coach - the lights weren't working and the train was rammed.
There's absolutely no harm in allowing other staff to travel for free - it used to be commonplace and legit and still should be.
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Precisely. You're not adding to the operating costs by being on the train.
The value of trained members of staff being on board in case of emergency far outweighs the 'cost' of them travelling for free.
Absolutely 100% correct - and its the way I look at this when I let TPE or ATW staff on board. I myself will always ask the relevant conductor if I m travelling with another TOC ( mainly TPE ) as it is courtesy etc.....
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As far as the PRIV card goes....I have yet to use mine. But thats more because when I ve spent all week working a train, I really dont want to be travelling on one in my spare time as I have had enough if I m honest.