On 18/03/2014 19:34, Roland Perry wrote:

http://metro.co.uk/2014/03/16/thousa...for-bus-after-
oyster-readers-charge-wrong-card-in-contactless-glitch-4610552/

"Just under one per cent of all Oyster and contactless journeys
involve a card clash and we are seeing this number continue to
drop each week."

Sorry, but 1% seems very high.

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).

The Metro story you referenced in the original post refers to buses -
CPC acceptance is not a trial on buses, it's been accepted as a fare
payment method since December 2012.

FWIW, trying my contactless credit card on validators (both on gates and
standalone) has resulted in an error message, can't remember which one.

There are now posters and signs around the transport network warning
against card clash, but I think the message should have been delivered
earlier and more forcefully.