wrote:
On Fri, 02 Sep 2016 13:46:50 +0100
Recliner wrote:
I must admit I don't understand why Crossrail and the North Kent line
have separate island platforms, rather than having the Crossrail pair
between the third rail tracks, thus allowing cross-platform
interchanges. The down third rail track could have been re-routed to
the north of the portal, so that it was on the north, rather than the
south of the new Crossrail pair. With that arrangement, both down
tracks would flank one island platform, and both up platforms the
other. It would save a lot of passengers the hassle of having to cross
from island platform to the other.

Presumably that would require the crossrail tracks to cross the 3rd rail ones
complicating signalling, power supply isolation and causing potential hold
ups on both lines due to a problem on the other.

No it wouldn't. The Crossrail portal would be between the up and
(slewed-north) down third rail tracks. The Crossrail tracks would stay
between the third-rail tracks until the former's buffer stops at Abbey
Wood. Beyond Abbey Wood, the two third-rail tracks would come together
again and resume their former alignment towards Dartford. It would be a bit
like how the diesel track pops up between the two Central line tracks at
Greenford.