In article . com,
"Mario Lanza" wrote:

Peter Fox wrote:
"John Rowland" wrote in message
...
http://www.tfl.gov.uk/tfl/press-cent...releases-conte
nt.asp?prID=934
Rubbish. There is a bowstring arch bridge on the Sheffield Supertram
system,
right in the middle of the city.

Peter Fox

Yeap, one quick search on Google can confirm this.

http://www.lusas.com/case/bridge/supertram.html

And the Saltash Bridge is a part-bowstring design, though perhaps that
doesn't count.

Sam

In article ,
Paul Scott wrote:

"Paul Scott" wrote in message
...


It also looks very similar to the structure which used to take the
railway from West Wylam to Scotswood, at Hagg Bank- that dates from the
mid 19th century, I believe. A search for photos of 'Wylam' and 'Peter
Robinson' should throw something up, as he seems to have taken hundreds
there.
Brian

A good source for NE structural images is 'Sine':

http://sine.ncl.ac.uk/view_image.asp...al_doc_id=4525

Paul S
The railway bridge at Wearmouth, Sunderland also shows as a bowstring. In
fact some research using google reveals that a vast number of arched bridges
are 'bowstring' i.e. the ends are tied. The Tyne Bridge (road) is recorded
as a bowstring arch - modelled on the West Wylam Railway bridge just up the
river...

And, as has been remarked earlier in the thread, the High Level Bridge in
Newcastle (which pre-dates all of these examples) is a multi-span
tied-arch bridge, albeit with the the rail deck carried on the tops of the
arches. The High Level opened in September 1849:

http://www.cycle-routes.org/hadrians...ings/high.html

Another bowstring railway bridge (erroneously claimed to be the oldest
wrought-iron railway bridge - the High Level is wrought iron) opened a
month later over the Thames at Windsor:

http://www.thamesweb.co.uk/windsor/w.../bridges2.html

In reality, these weren't going to be the first examples of tied arches
in railway use: the tied arch was first described in the early 17th
century (1617, in fact, by Veranscics[1]) and it is surely unrealistic to
expect that such a useful and economical type of bridge wouldn't have been
used for waggonways (in wooden form).

Robert Stephenson certainly used an iron tied-arch bridge in 1833 at Long
Buckby on the London and Birmingham railway[2] - so it's safe to say that
the TfL claim that the new ELR bridge is the first bowstring bridge to
carry a railway in .uk is but flagrant flapdoodle and blatant bosh.

[1] http://www.icomos.org/studies/bridges.htm
[2] http://www.robertstephensontrust.com/time.htm

--
Andy Breen ~ Not speaking on behalf of the University of Wales, Aberystwyth
Feng Shui: an ancient oriental art for extracting
money from the gullible (Martin Sinclair)

In article , Peter Masson wrote:

So at Whitechapel the high level platforms are the Underground, and the low
level platforms will be the Overground.

A fairly common occurrence in Berlin, where at some stations the U-bahn is at high level
and the S-bahn is at ground level or in a cutting.

J

On Fri, 17 Nov 2006, BH Williams wrote:


"Charles Ellson" wrote in message
news
On Thu, 16 Nov 2006 20:30:23 +0000, Tom Anderson
wrote:

On Thu, 16 Nov 2006, Chris Game wrote:

Charles Ellson wrote:

Isn't there a yonks-old bowstring bridge on a disused line somewhere up
near Penrith ?

There are several such bridges, some inverted.

Crumbs - how did that happen?

Kids probably. It's not safe to leave anything unattended nowadays.

Erector held the drawing upside down.....

Aaah. I was thinking it was part of some sort of railway / rollercoaster
hybrid setup. That would have explained why it's now disused. Bloody HMRI
bedwetters.

tom

--
It is better to create badly than to appreciate well. -- Gareth Jones

On Fri, 17 Nov 2006 13:32:33 +0000 (UTC), (Andrew
Robert Breen) wrote:


In reality, these weren't going to be the first examples of tied arches
in railway use: the tied arch was first described in the early 17th
century (1617, in fact, by Veranscics[1]) and it is surely unrealistic to
expect that such a useful and economical type of bridge wouldn't have been
used for waggonways (in wooden form).

Robert Stephenson certainly used an iron tied-arch bridge in 1833 at Long
Buckby on the London and Birmingham railway[2] - so it's safe to say that
the TfL claim that the new ELR bridge is the first bowstring bridge to
carry a railway in .uk is but flagrant flapdoodle and blatant bosh.

[1] http://www.icomos.org/studies/bridges.htm
[2] http://www.robertstephensontrust.com/time.htm

Something wrong with [2]. Long Buckby isn't on the London to
Birmingham line. I believe there was a bowstring bridge on the L & B
but cannot immediately trace where it was.

Incidentally Byran Morgan's Railways - Civil Engineering refers to a
'diminutive' bowstring bridge on the Stockton and Darlington Railway,
parts of which are preserved in the NRM.
--
Peter Lawrence

In article ,
Peter Lawrence wrote:
On Fri, 17 Nov 2006 13:32:33 +0000 (UTC), (Andrew
Robert Breen) wrote:


In reality, these weren't going to be the first examples of tied arches
in railway use: the tied arch was first described in the early 17th
century (1617, in fact, by Veranscics[1]) and it is surely unrealistic to
expect that such a useful and economical type of bridge wouldn't have been
used for waggonways (in wooden form).

Robert Stephenson certainly used an iron tied-arch bridge in 1833 at Long
Buckby on the London and Birmingham railway[2] - so it's safe to say that
the TfL claim that the new ELR bridge is the first bowstring bridge to
carry a railway in .uk is but flagrant flapdoodle and blatant bosh.

[1] http://www.icomos.org/studies/bridges.htm
[2] http://www.robertstephensontrust.com/time.htm

Something wrong with [2]. Long Buckby isn't on the London to
Birmingham line. I believe there was a bowstring bridge on the L & B
but cannot immediately trace where it was.

Incidentally Byran Morgan's Railways - Civil Engineering refers to a
'diminutive' bowstring bridge on the Stockton and Darlington Railway,
parts of which are preserved in the NRM.

The only Stephenson bridge that I can recall in the NRM is the Gaunless
Bridge, and I'm not entirely sure that's really a tied arch or a species
of curved truss:

http://www.makingthemodernworld.org....0-1880/IC.107/

--
Andy Breen ~ Not speaking on behalf of the University of Wales, Aberystwyth
Feng Shui: an ancient oriental art for extracting
money from the gullible (Martin Sinclair)