On 21/07/10 01:43, Mizter T wrote:

The basic thing is the system doesn't string it all together as a Tram
plus Tube/NR journey. This does I think actually make sense - let's
say you travel by tram from Ampere Way, get off at Merton Road tram
stop, meet a friend then walk down the road to Wimbledon Chase NR
station and touch-in (no gates here, just validators) - if the system
was designed to be too clever for its own boots it could assume you'd
travelled via Wimbledon and this was the end of your journey, hence
when you got to (say) Sutton you'd get hit with the unresolved journey
charge plus you'd have been ticketless and thus liable to a PF (or
more) on your Wimbledon Chase to Sutton journey. Hence, the system
doesn't try and make presumptions to do this, thus the need for some
intermediate validation at Wimbledon.

Well, similar to the kind of problem that OSI's sometimes create. But
yes, that does make sense; thanks for the detailed reply. I'm sure I
did understand that once, probably last time you explained it on this
group :-)

What I was failing to grasp (although I knew, really) is that since a
tram is like a bus, it's two journeys. I would never expect that I
could get off a bus and onto the tube without touching in, but then
buses don't stop on the paid side of the gateline, so the situation is
rather more intuitive.

-roy