What's the score with PayPal's Mastercard (which uses funds from you PayPal account) being used to pay for train tickets? I know Visa Electron, Solo and similar have issues for people who have bank accounts that don't allow you to go overdrawn.
I don't think PayPal issues those cards any more, so it might be a moot point. Solo is also defunct, and the railway doesn't accept Visa Electron.
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How does the railway know that this is the case? Are Guards/RPIs now allowed to look inside people wallets to check that they don't have a card and are in fact allowed to use their card?
That's not a question I can answer. It might come up in a court case sometime.