On Thu, 14 Oct 2010 11:53:48 +0100
"tim...." wrote:
I suppose the alternative is to check the balances "offline" and when you
find a discrepancy, program the gates not to accept that card, but that's
only going to work after the event and there's going to be no way of
stopping someone from using a different cloned card each day.

Or just reusing the same card if they've found a way to reprogram its id
number.

I did meant different "virtual" card. I didn't envisage that they would
have 1000s of physical cards

Well why not? If they save up to 5 quid on every trip whats 3 quid for a
another card? If they bought one card per trip they'd still be in the black.

B2003