In message , at 15:17:45 on Wed, 3 Sep
2014, Neil Williams remarked:

'Oyster Ticket Stops' (aka shops) can add the Railcard discount too.

That sounds rather open to fraud. "Yes, he showed it, honest guv", as
a fiver is slipped under the desk.

Although you need to carry the railcard with you, to prove it's really
the entitled person travelling and not an unentitled person you lent the
card to. At that point you might as well have people self-authenticating
themselves at a TVM.
--
Roland Perry