On Aug 9, 10:33*am, Chris Tolley (ukonline
really) wrote:

Roland Perry wrote:

In message
, at
14:11:42 on Sun, 8 Aug 2010, CJB remarked:

TfL explained that it could not be aware of any over-charging until
the issue was reported by a passenger.

Apart, of course, from looking for cards where there were two top-up
[bank charges] on the same day.

Yes - some passengers will do that, but that doesn't actually matter.
What you are looking for is top-ups where there were two debits but only
one amount of credit added.

Not holding an Oyster card, I wouldn't know, but in many cases the
financial part of e-transactions is handled separately for security
reasons. If that is the case here, then how would TfL know in detail
about the debits?

If by 'e-transactions' you are talking about an e-commerce (i.e.
online purchase) situation, then that wouldn't apply here as this
concerns people topping up their Oyster cards in person at self-
service ticket machines at LU stations.