"Piccadilly Pilot" wrote in message
...
See also Hammersmith siding, both ends

Are you sure about Hammersmith? I was under the impression that not only do
both ends have full a trap-point layout, but that these are also used by
long trains reversing which can't fit between the two turnouts.

In message , Bob Watt
writes

At least two locations on LU have switches which may well be unique to LU,
inasmuch as they can be set with both blades open, when they act as
catchpoints. The locations are a) east end of Earls Court District station,
and b) the turnback siding beyond West Hampstead (Jubilee Line). a
photograph of the latter appears on p.150 of "Principles of London
Underground Operations" by John Glover.

Rayners Lane siding does that too.
--
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In message , Piccadilly Pilot
writes

See also Hammersmith siding, both ends, and Wood Lane. Probably Down Street
is simlarly equipped.

Now you mention it, it is.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

In message , David Splett
writes

Are you sure about Hammersmith? I was under the impression that not only do
both ends have full a trap-point layout, but that these are also used by
long trains reversing which can't fit between the two turnouts.

I'll try and remember to have a look tomorrow, but I think he's right.
Belt & braces?
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

"Steve Fitzgerald" ] wrote in message
...

In message , David Splett
writes
Are you sure about Hammersmith? I was under the impression that
not only do both ends have full a trap-point layout, but that
these are also used by long trains reversing which can't fit
between the two turnouts.

I'll try and remember to have a look tomorrow, but I think he's
right.

Thanks. Other places where wide-to-gauge points are found that noone has
mentioned yet are King's Cross siding and Victoria sidings (Victoria Line).
Also, with reference to a previous poster who mentioned that they're unique
to LU, they can be found in Waterloo Depot on the Waterloo & City Line,
though whether this ever counted as non-LU is a matter of pedantry.

David Splett wrote:
"Piccadilly Pilot" wrote in message
...
See also Hammersmith siding, both ends

Are you sure about Hammersmith? I was under the impression that not
only do both ends have full a trap-point layout, but that these are
also used by long trains reversing which can't fit between the two
turnouts.

Yup, you're right, it's two sets of points each end.

In article , Bob Watt
writes
At least two locations on LU have switches which may well be unique to LU,
inasmuch as they can be set with both blades open, when they act as
catchpoints.

There's far more than two of these.

These are used where neither direction is really safe for "trapping" a
train that passes the protecting signal; the commonest location is a
central siding between running lines. Each blade is interlocked with the
points on the corresponding running line:

----------------N-------------------------
\ NORTHBOUND
----------------n-X-----------------------
\ \
\ \
\ S--------------------
X
/ N--------------------
/ / E
/ /
----------------s-X-----------------------
/ SOUTHBOUND
----------------S-------------------------

In normal circumstances the four blades N and S are open and the two
blades n and s are closed. Trains can proceed on the running lines. A
train passing the exit signal E will derail *in line with the track* as
it falls into the gap between the diverging stock rails.

To allow a train into or out of the siding from the northbound line,
points N are moved so that blades N are both closed and blade n is open.
Similarly for the southbound.

--
Clive D.W. Feather | Home:
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Written on my laptop; please observe the Reply-To address

In article , ] (Steve
Fitzgerald) wrote:

In message , Bob Watt
writes

At least two locations on LU have switches which may well be unique to
LU,
inasmuch as they can be set with both blades open, when they act as
catchpoints. The locations are a) east end of Earls Court District
station,
and b) the turnback siding beyond West Hampstead (Jubilee Line). a
photograph of the latter appears on p.150 of "Principles of London
Underground Operations" by John Glover.

Rayners Lane siding does that too.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

Are you sure that that is the same set up?
Both the controlled and Kevin Rose's diagrams shows a short stub past the
points, rather than their just being nothing

Roger

In article ,
(Piccadilly Pilot) wrote:

TheOneKEA wrote:
wrote:
In article , (Bob Watt)
wrote:


On 04/05/2004 13:01, in article ,
"Roland Perry"
wrote:


I'm trying to compile a list of interesting things to go see on the
"tube" on a day trip. Engineering mainly, like the crossover at the
end
of the Oxford St Bakerloo, the scale of Canary Wharf and the tunnel
out
of Bank-DLR. What others can the team suggest?

At least two locations on LU have switches which may well be unique
to LU,
inasmuch as they can be set with both blades open, when they act as
catchpoints. The locations are a) east end of Earls Court District
station,
and b) the turnback siding beyond West Hampstead (Jubilee Line). a
photograph of the latter appears on p.150 of "Principles of London
Underground Operations" by John Glover.


These can be found at various locations, usually at the exit from
sidings and where there is no space for the standard sand drag or
arrestor. They effectively put the train "on the deck" if the points
aren't set and the train carries on (the space between the running
rails just gets wider and wider until the bogie eventually drops
off!).

On the Northern Line these can be found at:
Archway siding, Finchley Central south siding and Tooting Broadway
siding diagrams are on Tubeprune's web site at:

http://www.trainweb.org/tubeprune/no...20diagrams.htm

Roger

They can also be seen at Rayners Lane.

Brad

See also Hammersmith siding, both ends, and Wood Lane. Probably Down
Street
is simlarly equipped.



Hammersmith sidings (both ends) - no
Down Street - yes
Wood Green - yes

Roger

l be unique
to LU,
inasmuch as they can be set with both blades open, when they act as
catchpoints. The locations are a) east end of Earls Court District
station,
and b) the turnback siding beyond West Hampstead (Jubilee Line). a
photograph of the latter appears on p.150 of "Principles of London
Underground Operations" by John Glover.

These can be found at various locations, usually at the exit from
sidings and where there is no space for the standard sand drag or
arrestor. They effectively put the train "on the deck" if the points
aren't set and the train carries on (the space between the running
rails just gets wider and wider until the bogie eventually drops off!).

On the Northern Line these can be found at:
Archway siding, Finchley Central south siding and Tooting Broadway
siding
diagrams are on Tubeprune's web site at:

http://www.trainweb.org/tubeprune/no...20diagrams.htm

Roger

Haven't had time to check the diagrams for the whole combine but, in
addition to any others that I've listed, they are also found at:

Willesden Green
Roger