On 31/03/2015 14:15, Roland Perry wrote:

In message , at 14:05:40 on Tue, 31 Mar
2015, Mizter T remarked:

It would be interesting to know what it is about the cards which stops
them working. A lot of people probably think "contactless" is some sort
of 'standard', but clearly it isn't.

EMV contactless is a standard. But come on, you know about standards...

There doesn't seem to be nearly as much of an interoperability issue
with the magstripes on cards, or the C&P (where they have one).

My limited understanding is that there have been different generations
of issues of contactless cards - in the future, as old cards expire and
new cards issued to the latest specifications, then most if not all EMV
contactless cards should work for 'transit applications' such as that of
TfL.

(I think I recall reading about the possibility of a small writeable
space on contactless cards of the future too, one that could be used by
transit applications.)