On Oct 20, 12:11 pm, Roland Perry wrote:
In message
, at
04:06:19 on Mon, 20 Oct 2008, D7666 remarked:

I won't believe it's finished until I
can get a through train from Cambridge to Gatwick - one of the original

I am now of the opinion you won't.

Even though they completed the tunnelling into SPILL I have alwys been
sceptical about connecting up GN to it.

They are going to all this trouble of re-arranging appoaches to
Blackfriars and south/east thereof to avoid as far as possible
conflicting moves to make 24 TPH in the core work, and then build a
new junction across which every move will conflict right *in* the
core ?!?!?!?

Is it a flat junction? I thought the northbound line tunnelled under.

--
Roland Perry


Each switch forms a flat junction on both roads - even if there is no
crossing by tunnelling.

When running 24 TPH you don't really want any points at all.

Don't forget these are long 12 car trains running into or out of the
SPILL station stop - and all trains will stop - they ain't going to be
high speed across the convergence point.

Take the Jubilee line now (before resgignalling). That is planned 24
TPH in the peaks, with trains half that length, and it barely works.
Now put in a new junction at say London Bridge, right off the end of
platforms of one of the busiest core stations, even with a dive/fly to
avoid a crossing, but nonetheless convergence points on both west and
eastbound roads. You reckon 24 TPH would still work ?

Camden Town and Kennington are similar problematic locations on the
Northern - thats why they want to split the servcie and avoid
convergences.

--
Nick


--
Nick

In article , (Roland
Perry) wrote:

In message
,
at 14:35:03 on Sun, 19 Oct 2008, Mr Thant
remarked:
The most significant parts of it don't happen until 2012-15
(rebuilding London Bridge and adding flyovers on its approaches,
wiring up the ECML connection, and replacing the whole fleet), so
you'd probably want to call it Thameslink 2015*.

(* unless you're in the camp who thinks the second phase won't
happen,
which I've been pondering joining)

Thameslink 2015 it is, then I won't believe it's finished until
I can get a through train from Cambridge to Gatwick - one of the
original attractions of the scheme for me.

Indeed, for me too. Will they be running them?

And what tickets can I get this week for Cambridge-London Zones 1-2, then
Clapham Jcn-Gatwick Airport, return via Thameslink St Pancras/King's
Cross? I'm assuming Saver Return Cambridge-Zones 1/2, Saver Return London
Terminals-Gatwick (not Gatwick Express).

--
Colin Rosenstiel

In article ,
(Paul Scott) wrote:

Not a total pessimist then, they won't believe it's finished until
they can get from Littlehampton to Kings Lynn...

King's Lynn is already off, I gather.

--
Colin Rosenstiel

In article ,
(Paul Scott) wrote:

There are a few bits in the Greater Anglia RUS which, although not
giving much away, suggest it is for train lengthening on the WA
route to Liverpool St. Perhaps ready for the 30 new 4 car trains
for the route...

The Cambridge island platform is entirely down to 12-car trains on WA.

--
Colin Rosenstiel

On 20 Oct, 12:30, D7666 wrote:
Don't forget these are long 12 car trains running into or out of the
SPILL station stop - and all trains will stop - they ain't going to be
high speed across the convergence point.

But what do you gain by moving the junction to south of the station?
The only net effect is a longer allowable dwell time as trains will be
able to do some of their waiting (to cross the junction) in a platform
rather than in the tunnel to the north.

So there's only a need for more than two platforms if you think the
dwell time allowed by 24 tph through each platform won't be
acceptable, which you could say about all of the central stations.

In other words, the junction is irrelevant.

U

In message , at 12:16:04 on
Mon, 20 Oct 2008, Paul Scott remarked:
It is about time NR brought their Thameslink site more up to date...

Maybe that's a reasonable target to have for 2012?
--
Roland Perry

In message
, at
04:30:46 on Mon, 20 Oct 2008, D7666 remarked:
When running 24 TPH you don't really want any points at all.

Don't forget these are long 12 car trains running into or out of the
SPILL station stop - and all trains will stop - they ain't going to be
high speed across the convergence point.

Those two seem mutually contradictory. There's plenty of time to change
the points while each train is stopped in the station.
--
Roland Perry

"Roland Perry" wrote in message
...
In message , at 12:16:04 on Mon,
20 Oct 2008, Paul Scott remarked:
It is about time NR brought their Thameslink site more up to date...

Maybe that's a reasonable target to have for 2012?

Good one! Even they might know what their final plan is by then, there'll
probably have been a decent drawing in Modern Railways by then...

Paul

On Oct 20, 2:15 pm, Roland Perry wrote:

Don't forget these are long 12 car trains running into or out of the
SPILL station stop - and all trains will stop - they ain't going to be
high speed across the convergence point.

Those two seem mutually contradictory. There's plenty of time to change
the points while each train is stopped in the station.

When I get some time I shall re-run something on a simulator that
shows why a platform stop right next switches either upstream or
downstream of a convergance point does reduce theoretical headway be
it conventional block or moving block signalling.

--
Nick

In message
, at
03:04:06 on Sun, 19 Oct 2008, Rupert Candy
remarked:
no signs of actual construction yet. I also noticed a stripy
eye-catching "Thameslink Project" information stand at Moorgate

Here's a visible sign at Luton Airport Parkway:

http://www.perry.co.uk/images/lap-sign.jpg

As commented a few months ago, the direct link to St Pancras has been
long-awaited...
--
Roland Perry