Overrun tunnels
 

Just out of curiousity , what are the longest overrun tunnels on the
Underground? My guess is Charing Cross but someone else reckons its Brixton.
Anyone know? Also , did the tunnels beyond charing cross ever get used by
trains for stabling or were they abandoned long ago?

B2003

Overrun tunnels
 

"Huge" wrote in message
...
(Boltar) writes:
Just out of curiousity , what are the longest overrun tunnels on the
Underground?

What's an overrun tunnel?

When the tunnel continues past the terminus so that if a train fails to stop
for any reason it doesn't go straight into a wall.

Peter Smyth

Overrun tunnels
 

Unless I'm very much mistaken, it was Boltar ),
in message who said:
Just out of curiousity , what are the longest overrun tunnels on the
Underground? My guess is Charing Cross but someone else reckons its
Brixton. Anyone know? Also , did the tunnels beyond charing cross
ever get used by trains for stabling or were they abandoned long ago?



From what I've heard:

Jubilee line extends from Charing X to Aldwich, including a lengthy reversal
siding.

(Technically, I'm not sure you can consider this overrun now as the Charing
X branch is closed anyway, so in effect it's an unused branch comprising
partly disused and partly unopened track).

Victoria Line South of Brixon negotiates a fairly tight curve as far as the
Upper Tulse Hill area where (in some proposals) a Station would've been
sited on the abortive Streatham extension.

Bakerloo Line beyond Elephant has one tunnel only that goes most of the way
to Camberwell.

At the north end of the Vic, it goes a fair distance towards walthamstow
wood st.

BTN

Overrun tunnels
 

"Ben Nunn" wrote in message ...
Unless I'm very much mistaken, it was Boltar ),
in message who said:
Just out of curiousity , what are the longest overrun tunnels on the
Underground? My guess is Charing Cross but someone else reckons its
Brixton. Anyone know? Also , did the tunnels beyond charing cross
ever get used by trains for stabling or were they abandoned long ago?



From what I've heard:

Jubilee line extends from Charing X to Aldwich, including a lengthy reversal
siding.

(Technically, I'm not sure you can consider this overrun now as the Charing
X branch is closed anyway, so in effect it's an unused branch comprising
partly disused and partly unopened track).

Victoria Line South of Brixon negotiates a fairly tight curve as far as the
Upper Tulse Hill area where (in some proposals) a Station would've been
sited on the abortive Streatham extension.

Bakerloo Line beyond Elephant has one tunnel only that goes most of the way
to Camberwell.

At the north end of the Vic, it goes a fair distance towards walthamstow
wood st.

BTN

So what is at the end of the Charing X overrun? Was any work begun on
the Aldwych station itself?

Overrun tunnels
 

"Huge" wrote in message
...
"Peter Smyth" writes:

"Huge" wrote in message
...

What's an overrun tunnel?

When the tunnel continues past the terminus
so that if a train fails to stop
for any reason it doesn't go straight into a wall.

Ah. Thank you.

More to the point, safety rules stipulate that a train must approach a dead
end at very slow speeds. If there is an overrun tunnel, the trains can enter
the terminal station at the same speed as any other station. This slightly
improves journey times to and from the last station: more importantly, it
also increases the service frequency that can be run with a given number of
trains and drivers. It also increases the maximum number of trains that can
be run into the terminal station, and so possibly increases the number of
trains that can be run on the entire line.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes

Overrun tunnels
 

"Ben Nunn" wrote in message ...
From what I've heard:

Jubilee line extends from Charing X to Aldwich, including a lengthy reversal
siding.

(Technically, I'm not sure you can consider this overrun now as the Charing
X branch is closed anyway, so in effect it's an unused branch comprising
partly disused and partly unopened track).

Victoria Line South of Brixon negotiates a fairly tight curve as far as the
Upper Tulse Hill area where (in some proposals) a Station would've been
sited on the abortive Streatham extension.

Bakerloo Line beyond Elephant has one tunnel only that goes most of the way
to Camberwell.

At the north end of the Vic, it goes a fair distance towards walthamstow
wood st.

Do trains ever run down these tunnels or are they just for emergencies only
or derelict? Does anyone know if they have special exits to the street at the
end, since if a train did run down there and be stabled how would the driver
get out , would he have to walk down the track back to the terminus station?

B2003

Overrun tunnels
 

"Ben Nunn
From what I've heard:

Jubilee line extends from Charing X to Aldwich, including a lengthy reversal
siding.

Charing Cross station = 42.39km, end of line = 41.86km



Victoria Line South of Brixon negotiates a fairly tight curve as far as the
Upper Tulse Hill area where (in some proposals) a Station would've been
sited on the abortive Streatham extension.

Brixton station = 48.61km, end of line = 49.02km



Bakerloo Line beyond Elephant has one tunnel only that goes most of the way
to Camberwell.

No track in tunnel, so don't know the distance of that one, sorry!



At the north end of the Vic, it goes a fair distance towards walthamstow
wood st.

Walthamstow station = 27.33km, end of line = 26.98km


PhilD

--

Overrun tunnels
 

"Huge" wrote in message
...
"Peter Smyth" writes:

"Huge" wrote in message
...
(Boltar) writes:
Just out of curiousity , what are the longest overrun tunnels on the
Underground?

What's an overrun tunnel?

When the tunnel continues past the terminus so that if a train fails to
stop
for any reason it doesn't go straight into a wall.

Ah. Thank you.

Bloody hell, Huge? are u thick or sommat?

--
regards,
Pre`38 tube [DR]
westLondon, UK

Overrun tunnels
 

In article ,
(John Rowland) wrote:

"Huge" wrote in message
...
"Peter Smyth" writes:

"Huge" wrote in message
...

What's an overrun tunnel?

When the tunnel continues past the terminus
so that if a train fails to stop
for any reason it doesn't go straight into a wall.

Ah. Thank you.

More to the point, safety rules stipulate that a train must approach a
dead end at very slow speeds. If there is an overrun tunnel, the trains
can enter the terminal station at the same speed as any other station.
This slightly improves journey times to and from the last station: more
importantly, it also increases the service frequency that can be run
with a given number of trains and drivers. It also increases the maximum
number of trains that can be run into the terminal station, and so
possibly increases the number of trains that can be run on the entire
line.

That isn't the initial reason why the Charing Cross (Jubilee) overrun
tunnels are so long. The line was planned with the expectation of imminent
extension in that direction. Highly restrictive approach speeds to dead
ends are a product of the 1975 Moorgate crash.

--
Colin Rosenstiel

Overrun tunnels
 

"John Rowland" wrote in message
...
"Huge" wrote in message
...
"Peter Smyth" writes:

"Huge" wrote in message
...

What's an overrun tunnel?

When the tunnel continues past the terminus
so that if a train fails to stop
for any reason it doesn't go straight into a wall.

Ah. Thank you.

More to the point, safety rules stipulate that a train must approach a
dead
end at very slow speeds. If there is an overrun tunnel, the trains can
enter
the terminal station at the same speed as any other station. This slightly
improves journey times to and from the last station: more importantly, it
also increases the service frequency that can be run with a given number
of
trains and drivers. It also increases the maximum number of trains that
can
be run into the terminal station, and so possibly increases the number of
trains that can be run on the entire line.


A good example of this is on the Victoria Line where trains under full ATO
approach termini at full operating speed. :) Does anyone know of any other
lines which have this feature?