In message , at
16:07:36 on Tue, 18 Dec 2007, Tom Anderson
remarked:
It also makes journeys *through* London easier to do. Swapping
between a hypothetical Bedford-Brighton train and a
Cambridge-Dartford train.

Yes, it means you wouldn't have to turn round 180 degrees after
stepping off the first train before you wait for the second one.

It's the "waiting for the next one" that's most important.

Having cross-platform interchange like that will also reduce the number
of people hanging around waiting.
--
Roland Perry