In message , at 21:17:28 on
Wed, 19 Mar 2014, Tony Dragon remarked:
My experience of card clash is an error 94 & the gates don't open.

I didn't think that gates were enabled for contactless cards yet.

Given there's a not-insignificant trial running, I'd suggest they are.

I'd forgotten about the trial.

But it's very worrying that they are charging the credit cards of people
not signed up to the trial. That seems to me to be completely wrong, on
many levels (for example, it means anyone can join the 'trial' just by
proffering their card).

Neither card was charged, but the gates would not open.

Contactless card, oyster card & fredom pass all clash.

Yes, that's your experience. Others (albeit only reported in the press
so far on buses) is that two cards can be recognised, and both "charged"
(although one might be a season, but that's still an overcharge
scenario).
--
Roland Perry