"tim...." wrote:

It's not the technology that important here but the fare structure.

There are several other metro areas using exactly the same technology
where there is no opportunity for a systematic overcharge to occur.


Hmm... there is a weakness in the technology in the sense that the 'OSI max
journey time-out' issue exists - whether similar issues exist with other
smartcard systems I don't know - perhaps some don't have the OSI concept,
which means such a thing would never surface in the first place.

(I'll endeavour to write a (vaguely) considered and (hopefully) concise
response to the original post once I've had a look at the report.)