Noticed one sitting there today mid morning. Why would it be down there,
spare stabling or testing?

On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

--
Spud

In article , d
() wrote:

Noticed one sitting there today mid morning. Why would it be down there,
spare stabling or testing?

On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Brake testing at South Ealing? The line was cleared to just short of
Hounslow West IIRC.

--
Colin Rosenstiel

Colin Rosenstiel wrote in message
...

In article , d
() wrote:
On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Brake testing at South Ealing? The line was cleared to just short of
Hounslow West IIRC.

Until the early 1960s there were a few District trains which ran to (the old
station at) Hounslow West.

Peter

In article ,
(Peter Masson) wrote:

Colin Rosenstiel wrote in message
...

In article ,
() wrote:
On a similar note - how far down the piccadilly line towards heathrow
can surface stock venture?

Brake testing at South Ealing? The line was cleared to just short of
Hounslow West IIRC.

Until the early 1960s there were a few District trains which ran to
(the old station at) Hounslow West.

1964. I found a sign about the service partly uncovered at Earl's Court only
a few months back.

--
Colin Rosenstiel

On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
writes
On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would they
actually drag a train down there at night to see if it bumped the scenery?

--
Spud

wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would they
actually drag a train down there at night to see if it bumped the scenery?

Not sure, but I notice there's an article in the latest Rail magazine about
S stock venturing to Northfields, Ealing Broadway, etc. As these are all
places where older surface stock went, I assume they have a pretty good
idea that S stock will fit, and drive the first train slowly. If in doubt,
I suppose they could use a gauging test vehicle first, with polystyrene
cladding.

One reason cited for going to Northfields was to be be reassured what would
happen if a future District line train was accidentally sent that way
(ditto to North Ealing, etc, as mistakes do happen at that junction, and
that branch of the Picc is sometimes used for SSL stock transfers). These
were, of course, originally District line branches anyway, and engineered
for surface stock.

On 2014\05\30 21:26, d wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would they
actually drag a train down there at night to see if it bumped the scenery?

I suspect a tube gauge train with polystyrene bits stuck on the corners
and centres to make it simulate the size of an S-stock will have gone
first, but because trains swing as they move in a way which depends on
the suspension, weight distribution and speed, there is no substitute
for a real train travelling at real speeds, but I imagine they use sacks
of stuff to represent the weight of people.

In article
,
(Recliner) wrote:

wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards heathrow
can surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would
they actually drag a train down there at night to see if it bumped
the scenery?

Not sure, but I notice there's an article in the latest Rail magazine
about S stock venturing to Northfields, Ealing Broadway, etc. As these are
all places where older surface stock went, I assume they have a pretty
good idea that S stock will fit, and drive the first train slowly. If in
doubt, I suppose they could use a gauging test vehicle first, with
polystyrene cladding.

One reason cited for going to Northfields was to be be reassured what
would happen if a future District line train was accidentally sent that
way (ditto to North Ealing, etc, as mistakes do happen at that junction,
and that branch of the Picc is sometimes used for SSL stock transfers).
These were, of course, originally District line branches anyway, and
engineered for surface stock.

Good points. Don't forget the brake testing stretch between Northfields and
Acton Town as well.

--
Colin Rosenstiel

wrote:
In article
,
(Recliner) wrote:

wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards heathrow
can surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would
they actually drag a train down there at night to see if it bumped
the scenery?

Not sure, but I notice there's an article in the latest Rail magazine
about S stock venturing to Northfields, Ealing Broadway, etc. As these are
all places where older surface stock went, I assume they have a pretty
good idea that S stock will fit, and drive the first train slowly. If in
doubt, I suppose they could use a gauging test vehicle first, with
polystyrene cladding.

One reason cited for going to Northfields was to be be reassured what
would happen if a future District line train was accidentally sent that
way (ditto to North Ealing, etc, as mistakes do happen at that junction,
and that branch of the Picc is sometimes used for SSL stock transfers).
These were, of course, originally District line branches anyway, and
engineered for surface stock.

Good points. Don't forget the brake testing stretch between Northfields and
Acton Town as well.

Yes, but I don't think that was mentioned in the article. I wonder if it's
still needed for "packaged" trains like the S stock, as opposed to previous
LU-designed and modified stock? All S stock trains are tested before
delivery at Old Dalby, and I don't suppose LU will change the brake specs
of in-service trains without reference to Bombardier.

In article
,
(Recliner) wrote:

wrote:
In article
,
(Recliner) wrote:

wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards
heathrow can surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would
they actually drag a train down there at night to see if it bumped
the scenery?

Not sure, but I notice there's an article in the latest Rail magazine
about S stock venturing to Northfields, Ealing Broadway, etc. As these
are all places where older surface stock went, I assume they have a
pretty good idea that S stock will fit, and drive the first train
slowly. If in doubt, I suppose they could use a gauging test vehicle
first, with polystyrene cladding.

One reason cited for going to Northfields was to be be reassured what
would happen if a future District line train was accidentally sent that
way (ditto to North Ealing, etc, as mistakes do happen at that
junction, and that branch of the Picc is sometimes used for SSL stock
transfers). These were, of course, originally District line branches
anyway, and engineered for surface stock.

Good points. Don't forget the brake testing stretch between
Northfields and Acton Town as well.

Yes, but I don't think that was mentioned in the article. I wonder if it's
still needed for "packaged" trains like the S stock, as opposed to
previous LU-designed and modified stock? All S stock trains are tested
before delivery at Old Dalby, and I don't suppose LU will change the brake
specs of in-service trains without reference to Bombardier.

I can't imagine that things won't change over the next 40 years however.

--
Colin Rosenstiel