On Tue, 24 Apr 2007 11:40:13 +0100, Tom Anderson wrote:
On Mon, 23 Apr 2007, MIG wrote:
The ticket gates usually stay where they are. Readers in trains along
with some kind of GPS would save on the ridiculous going up the
escalator situation when passing the boundary of your paper travelcard,

Serves you right for having a paper travelcard .

Gates should be able to do this; say you have a Z12 paper travelcard and
an oyster with some pre-pay, and you go from Z1 to Z4, when you want to
get out at your destination, you should be able to stick your paper card
in, have it rejected with an 'excess fare required' message, then touch
your oyster to pay it. Well, that would be nice, anyway.

That wouldn't work. People would get to the zone 4 barrier with
their zone 1-2 ticket, get an excess fare required message and
wonder off to find a member of staff if they don't have an Oyster
card. Meanwhile the person behind them would end up paying the
excess fare from their Oyster balance.

David