I also wonder how a regular commuter would travel without any means of payment. I get very uncomfortable if I am out without some money, or means to get access to money. I have to begin wondering if someone refusing to pay is merely trying to take a stand.
That struck me too. I certainly wouldn't travel (especially into Central London) without cash and/or cards. What if you lost your Oyster card?
I also find it odd that somebody would head for a train thinking "I won't take my cards or any cash, but I must make sure I take my driving licence".
My advice - pay up now if possible. If not, wait for their letter, offer a grovelling apology ("unfamiliar with the train, didn't realise it was 1st Class, very sorry") and ask for an out-of-court settlement. Which will cost you more than the offer on the day ...
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I think what surprises people more is that in the 21st Century, a privately owned company is able to generate revenue for the benefit of shareholders by wielding the full might of the state to impose financial penalties in situations which are grossly unfair to passengers. On top of that, they do so in a manner which is inconsistent, opaque and seems designed to make sure that a TOC will get its money, no matter what, all thanks to a set of archaic Victorian bylaws.
So how should the Train Operating Companies deal with people who buy a Standard Class ticket and then sit in First Class seating?