On Jan 9, 1:20*pm, "Recliner" wrote:
wrote in message

First it was because tube trains are too narrow, then it was because
they're not articulated, now you're grasping at this straw. Just
admit you were wrong.

If the bogies are very near the car ends, then the effect is close to
articulation. But with the circular profile of Tube tunnels, I'm certain
that reasonable sized open gangways are not feasible without true
articulation. If you look at the relative movement of Tube car ends, you
can see just how difficult it would be -- look at how much smaller the
gangway is compared to the outer body in S stock and 378s in order to
accommodate all the movement.

So, sorry Boltar, you won't be seeing open gangways in LU Tube stock in
the absence of articulation.

Wrong. The original plan to have walk though Tube trains did not use
articulation. what they did instead was make the cars shorter so it
could flex better. The original S Stock was not designed for the SSL
but the Victoria Line. The idea being you went from 8 cars to 12 cars
with silmar train lengths.

Problem was this was being done just before PPP, which when Metronet
came in and saw the design was a risk they weren't will to run, so the
project was put on the back burner. Meaning the 09ts was designed and
lessons learnt from the S stock SSL version were put into practise and
are now being built.