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Jason · October 22nd 04, 11:13 AM posted to uk.transport.london

On Thu, 21 Oct 2004 17:01:11 -0000, (Mark Brader) wrote:

"Malcolm & Nika" writes:
They are solely checking for people who travel through zone 1
without a zone 1 ticket. This is marked on the ticket with the
nice colour triangles... If it was bought north of the river in
a zone 3 to a zone 2 station it will have north colourings.
It will still let you out in a zone 2 station allowing you to
travel through zone 1.

That makes sense -- except for the part about the gates.

If there are tickets that would be valid in terms of starting and
ending zones alone, but aren't valid for any possible route from the
point of issue to a particular station, why isn't it the case that
(1) the tickets carry enough encoded information for this to be
worked out, and (2) the gates are programmed to reject them?

In my limited knowlesge of this, I think paper tickets don't carry
enough data to establish this.

I know someone who from time to time travels from a Zone 3 Underground
station to another Zone 2 station via Zone 1, with a Zone2/3 ticket -
and the ticket works at each gateline.

This is why Oyster came in and why I've experienced ticket checks in
the depths of Green Park in the interchange areas between the
Victoria, Piccadilly and Jubilee lines.

Cheers,

Jason.