On Sat, 30 Jul 2011 18:39:13 +0100, Paul Scott
wrote:



"andypurk" wrote in message
newsp.vzfzca0iyfeo2q@pc-prime...
On Fri, 29 Jul 2011 18:27:41 +0100, Paul Corfield
wrote:

One small question - is it still the case that there will be a flat
junction south of Blackfriars where the LOB and E&C routes diverge?

I can't imagine anything fancy like flyunders can be put in place
given the CX line alignment. Nonetheless that is going to some
challenge to get 18 tph in both directions across a flat junction
without too many conflicts given the pretty long distance nature of
many of the services and risks of late running.

The flyover/dive under for the New Cross Gate route trains will be to
the east of London Bridge. Thameslink services will use the platforms
currently used by Charing Cross trains and the existing two track route
over Borough Market. The Charing Cross services will generally be using
the new platforms to be built to the south of platforms 1-6 and the new
bridge over Borough Market recently put in place (but with no track due
to be laid until later on in the project).

I believe Paul C was actually asking about the flat crossing moves
needed immediately south of Blackfriars. There's definitely a conflict
there between the 18 tph coming from London Bridge, and the 6 tph
towards Elephant and Castle. Of course trains in the opposite
directions don't cross each other, they just have to merge...

Therefore his point is that there is only very limited space along the
line of route to fit in an underpass - because of the proximity of the
CX approach lines; but perhaps a flyover for the Thameslink down line
towards Elephant would be feasible, even if unusually high...


So he did, I wasn't paying attention. However the flat junction with a 3:1
split isn't so bad, especially as the route will be under ATO through the
junction and presumably there will be the opportunity to have a bit of
recovery time at Elephant and Castle or London Bridge for the Up trains
(due to having more than one platform available) allowing train to arrive
at the junction at the correct time. I would imagine that the junction at
St. Pancras may be more of an operational problem with only a single
platform to accommodate the merging trains from two routes.

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