On 6 June, 18:14, Paul Corfield wrote:
On Sat, 6 Jun 2009 09:44:43 -0700 (PDT), Mr Thant

wrote:
On 6 June, 17:29, Paul Corfield wrote:
Did you touch out at Wembley Central? *If you didn't then I can fully
understand why a touch in at Wembley Stadium would, in fact, end your
original journey from Picc Circus (as recorded on your card).

It should still allow an onward journey though, shouldn't it? My
understanding is that if you touch a free-standing validator your
journey is still able to be reopened - so if he'd have touched out at
Marylebone it would extended the end point of journey. This is
certainly how it's behaved for me.

Eh? *Validators simply set your card to the opposite of its previous
state assuming other factors are also valid. In other words if the last
thing you did was enter then it will set exit assuming zones and PAYG
money and max journey time is all logical and valid. *It may set some
additional data if an OSI is involved - I have not yet checked to see if
Wembley Central and Wembley Stadium are part of an OSI or not.

Or in other words, the gripper's machine (or the gripper) isn't
programmed to detect this state.

I don't know how the Chiltern reader is programmed - do you? *You're
making a very definitive statement there and from my (old) experience of
readers it's often largely down to how sophisticated the hand held
reader is as to what it displays and interprets from the card.

Speaking of incorrectly programmed Oyster machinery, last week I took
a train from Stratford to Tottenham Hale to use the Victoria Line, but
because I went straight to the tube gateline without first touching a
validator on the NR platforms, I was charged £4 for the train journey.
Grrr.

Surely it's you who made the error? *You were exiting from the NR "side"
of the OSI so needed to record an exit on the validator. You "entered"
at the Vic Line and a failure to record your exit from NR got you the £4
charge. *I don't see how there is an Oyster failing here no matter how
galling it is for you to have incurred a £4 charge.
--
Paul C

Only if the punter is expecting Totenham Hale to be an OSI, rather
than a straightforward interchange during a single journey. I think
that confusion is reasonable.