On 29 Jun 2006 15:46:07 -0700, Mizter T wrote:

"Oyster can cope with an entry followed by two exits, as it just
extends the journey. However two entries followed by one exit will lead
to an unresolved journey."

...so you can go in (once), out (once), be let back in through the
manual gates and out (a second time). Being let back in at the gates
wouldn't count on your Oyster card.

Interesting. Does this apply to all exits, even ones at the barriers
on the way out of a station, where you can't just be changing to
another line? I'd have expected you to end up with a complete journey,
followed by an unresolved (unstarted) journey.

The other kind of validator is ones like the platform ones at Ealing
Broadway, where you might be ending your journey (transferring to NR)
or you might not be (either changing between District and Central, or
on your way to the station exit where there are barriers). AFAIK these
ones definitely work as you describe.