On Sat, 3 May 2008 15:58:46 -0700 (PDT), MIG wrote:

[1] Mizter T, if you're reading this and still keen on experimenting,
here's one that would help here. When you do an out-of-station
interchange, what happens if you miss out one of the touches at the
interchange?

I think I can answer that one. Due to the awful positioning of the
readers at Heron Quays, I had marched well past them on leaving the
DLR before realising they were behind me, and assumed that as long as
I touched in at Canary Wharf Jubilee, it would tag me as going through
that interchange.

I was wrong. It wouldn't let me through the gate. It then wouldn't
let me rectify the situation by going back to the DLR, having touched
and been rejected at the Jubilee gate.

In fact, I couldn't proceed before queuing at the ticket office, where
it was still coct up and I ended up being charged two journeys instead
of a continuation.

Now that's really odd. Not letting you through the Jubilee gate I can
understand, but what (specifically) was it that made the DLR reader
reject the card? Maybe the card gets put into some sort of "get
rejected by everything until situation manually resolved" state.

Was this before or after the £4 penalty was introduced? ISTR (BICBW)
stories of exit gates not letting people out if they tried to touch
out without having previously touched in, but not recently.