In message , at 00:06:13 on Thu, 18
Jun 2009, Peter Smyth remarked:
Just seen on another forum that members are arranging a Zone 1
(except Blackfriars) 'Tube challenge' where they aim to visit all
stations in the shortest possible time for a competition between
members (not a world record attempt or anything).

It has been raised that there may be problems with Oyster PAYG and
that users should instead buy a z1-2 Travelcard. What would happen if
someone touched in and didn't touch out again for say 3 hours, even
then they may touch out at a different location? Would there be the £4
minimum charge or would something else happen?

You would be charged two £4 fares. The system would consider the touch
in and touch out to be two separate journeys as they are more than 2.5
hours apart.

But there must be some opportunities for "quick touches". For example at
Farringdon where there are validators on the platform (for transfer to
Thameslink).

I assume touching one of those twice would end one journey then start a
new one.
--
Roland Perry