On 3 Aug, 22:10, (Colin Rosenstiel) wrote:
In article , (Roland



Perry) wrote:
In message . uk,
at 21:30:00 on Sun, 3 Aug 2008, Colin Rosenstiel
remarked:
Why can't they terminate at Chesterton Parkway?

Only one terminating platform. I'm not sure it will accommodate 12 car
trains either.

No planning has included 12 car trains on West Anglia until a very
recent plan mainly concerned with issues nearer London but where
Cambridge is the only practical termination point. At least that's
my reading of it. I'm assured that the case for Chesterton Parkway
is unaffected, mainly because CB1 depends on diverting the cars from
the existing station.

So how will Chesterton Parkway work? Shuttling one unit down to
Cambridge to connect with the remainder... and with only one
platform it'll be challenging to have sufficiently regular trains
to attract commuters in their cars.

It will have two through platforms as well as a terminating bay. Some
trains will go through Cambridge to terminate there instead of at
Cambridge. I don;t think they will be 12-car though I don't recall it
being discussed in the Chesterton plans.

--
Colin Rosenstiel

I don't know why they can't make the new island platform the same
length as the (extended) existing one, with the existing through
access line being used to provide access to both platforms on the new
face (or even just having a traditional pair of through lines
providing the access to both platforms per face). You could then also
have another pair of faces on the other side of the island for the
terminating Norwich/Ipswich services, removing conflicts with the
northbound services via Ely. That would give Cambridge 10 platforms (6
of which that could take 12 coach trains), with (if my guestimates are
good enough, still enough room for a freight line on the eastern side.
Additionally, I guess you could use the centre face of the island (the
one facing the existing face) for terminating services, leaving the
outer new face for though services south; centre terminating roads are
always useful as they don't cross either through line when entering or
exiting. That would also provide a pair of 12-car terminating
facilities at Cambridge for not much more than the cost of the island
anyway, as most of the additional work would mainly be trackwork and
signalling.

Thoughts?