On Tue, 9 Sep 2014 13:00:11 +0100, Roland Perry wrote:
And with Oyster there's at least the chance that you can see your
balance disappearing, if you know exactly where to look on a gate for
the fraction of a second it displays the number. I'm quite sure there's
no such facility for the contactless cards.

I'm a member of the contactless pilot and on my journey home this
evening both gates gave me red lights while opening but the exit gate
also displayed my fare. I've just checked the online version and that
is matching what I expected to pay and what was shown on the gate.

I'm not really sure how that happened. I'll have to look more closely
at the displays next time and perhaps try and get a picture.