In article , ] (Steve
Fitzgerald) wrote:

In message ,
writes
Rayners Lane siding does that too.
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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

If you're asking about Rayners, yes. I was in there today and can
definitely confirm it is two separately controlled blades. There is no
stub there.

I did check Hammersmith today on the way past and can confirm that it's
two standard points into a stub at both ends, which is defaulted to the
stub. DS was right about long trains too, I remember comments during
my training about engineering trains having to do that.
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Thanks

I'll have to ask Kevin about that one as the diagram also shows a track
circuit for the stub which the other sidings do not, and I'm not quite
sure of the purpose of that.

Roger

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.

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In article , Roland Perry
writes
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?

On the East London Line, as well as the Thames Tunnel, the line runs
through the bottom of a (now filled in) dock north of Wapping.

Look out for closed stations. Sometimes empty spaces (as at South
Kentish Town), sometimes walls (as at Down Street). At Tower Hill you
can still see the staircases.

On a northbound Northern Line CX Branch train approaching Camden Town,
you can see the other platform from the one you're going to use.

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