In message
, at
02:28:14 on Tue, 11 Dec 2007, Mr Thant
remarked:
Why are the platforms at St Pancras Thameslink so massive in width?

There has been some discussion of whether or not the box was designed to
a take two island platforms, but reduced to the current layout to save
costs. Now that it's possible to access the station, perhaps we can see
if it would be possible to steal the outer edges of each platform to
make a track each side, to regain an island layout?

I had a think about this when I was there on Sunday. The answer is
probably yes, but you'd be left with Clapham style islands and
escalators no nowhere.

You'd have to move things like the escalators.

Sorry, I wasn't very clear. The platforms would be two feet wide, so
installing anything wider than a stepladder would block access to the
south end.

The platforms can't both be "massive" and "only 2 ft wide" - if an extra
track was inserted. Anyone done some measurements?
--
Roland Perry

On 11 Dec, 10:33, Roland Perry wrote:
In message
, at
02:28:14 on Tue, 11 Dec 2007, Mr Thant
remarked:



Why are the platforms at St Pancras Thameslink so massive in width?

There has been some discussion of whether or not the box was designed to
a take two island platforms, but reduced to the current layout to save
costs. Now that it's possible to access the station, perhaps we can see
if it would be possible to steal the outer edges of each platform to
make a track each side, to regain an island layout?

I had a think about this when I was there on Sunday. The answer is
probably yes, but you'd be left with Clapham style islands and
escalators no nowhere.

You'd have to move things like the escalators.

Sorry, I wasn't very clear. The platforms would be two feet wide, so
installing anything wider than a stepladder would block access to the
south end.

The platforms can't both be "massive" and "only 2 ft wide" - if an extra
track was inserted.

Whyever not? The kind of "massive" we're talking here is only like,
say, the southbound platform at Angel (ie unusually large for an
underground station), and that's equal to one track plus a tiny
island.

U

In message
, at
03:36:48 on Tue, 11 Dec 2007, Mr Thant
remarked:
The platforms can't both be "massive" and "only 2 ft wide" - if an extra
track was inserted.

Whyever not? The kind of "massive" we're talking here is only like,
say, the southbound platform at Angel (ie unusually large for an
underground station), and that's equal to one track plus a tiny
island.

I think we can only resolve this with some measurements!
--
Roland Perry

In article , (Roland
Perry) wrote:

In message
,
at 03:36:48 on Tue, 11 Dec 2007, Mr Thant
remarked:
The platforms can't both be "massive" and "only 2 ft wide" - if
an extra track was inserted.

Whyever not? The kind of "massive" we're talking here is only like,
say, the southbound platform at Angel (ie unusually large for an
underground station), and that's equal to one track plus a tiny
island.

I think we can only resolve this with some measurements!

My impression tonight was that the platform widths vary along their
lengths. Looking carefully at the North end where you can see the
trackless GN tunnels (why are they fully lit, BTW?) it would appear that
there is room for four tracks, but just not enough platform between them.

--
Colin Rosenstiel

In article , Roland Perry
writes
The platforms can't both be "massive" and "only 2 ft wide" - if an
extra track was inserted. Anyone done some measurements?

I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

--
Clive D.W. Feather | Home:
Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org
Fax: +44 870 051 9937 | Work:
Please reply to the Reply-To address, which is:

In message , at 09:24:24 on Tue, 18
Dec 2007, Clive D. W. Feather remarked:
The platforms can't both be "massive" and "only 2 ft wide" - if an
extra track was inserted. Anyone done some measurements?

I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

How much of that would need to be stolen, to add a track, if it was
converted to an island?
--
Roland Perry

In article , (Roland
Perry) wrote:

In message , at 09:24:24 on
Tue, 18 Dec 2007, Clive D. W. Feather
remarked:
The platforms can't both be "massive" and "only 2 ft wide" - if
an extra track was inserted. Anyone done some measurements?

I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

How much of that would need to be stolen, to add a track, if it was
converted to an island?

Most. It would be Clapham style or worse, even. Stand at the Northern end
where you can see the walls of the box and you'll see what I mean.

--
Colin Rosenstiel

In article , Roland Perry
writes
I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

How much of that would need to be stolen, to add a track, if it was
converted to an island?

Standard loading gauge width, which IIRC is 2.95 metres.

--
Clive D.W. Feather | Home:
Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org
Fax: +44 870 051 9937 | Work:
Please reply to the Reply-To address, which is:

In message , at 12:08:30 on Tue, 18
Dec 2007, Clive D. W. Feather remarked:
I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

How much of that would need to be stolen, to add a track, if it was
converted to an island?

Standard loading gauge width, which IIRC is 2.95 metres.

So the island platform would end up being 3-4 metres wide.

4 metres seems to be the minimum para C3.5 (or 5 metres if it has things
like lamp-post down the centre):

http://www.rgsonline.co.uk/docushare...7/GIRT7016.pdf
--
Roland Perry

In message
"Clive D. W. Feather" wrote:

In article , Roland Perry
writes
I used the southbound platform this morning. It looks to be 6 to 7
metres wide along most of the length.

How much of that would need to be stolen, to add a track, if it was
converted to an island?

Standard loading gauge width, which IIRC is 2.95 metres.


Which leaves a 3 to 4 metre platform which would be adequate I should
think. According to How The Underground Works (LT 1968) Ministry of
Transport limits were 6 ft (1.82m) for a single platform and 12 ft (3.66m)
for an island platform. Tube station platforms are normally 10'6". (3.2)

--
Graeme Wall
This address is not read, substitute trains for rail.
Transport Miscellany at http://www.greywall.demon.co.uk/rail/index.html