I have a question that's been bugging me for some time. When you're
travelling northbound on the city branch of the Northern line, as you
approach Angel, the train appears to pass diagonally across an enlarged
section of tunnel (ie, an open space suddenly appears on one side and as the
wall moves closer on approach to the station, the wall on the other side of
the train seems to move away). Upon leaving the station, the same thing
happens in reverse. Can anyone explain this?

Also, judging by the size of the southbound platform, I'm assuming that this
was where the original station was, and that the old northbound line was
covered up by the platform. If this is so, do the original NB tunnels still
exist behind the walls at the ends of the platform?

Many thanks,

Daniel.

"Heliomass" wrote in message
...
I have a question that's been bugging me for some time. When you're
travelling northbound on the city branch of the Northern line, as you
approach Angel, the train appears to pass diagonally across an enlarged
section of tunnel (ie, an open space suddenly appears on one side and as
the
wall moves closer on approach to the station, the wall on the other side
of
the train seems to move away). Upon leaving the station, the same thing
happens in reverse. Can anyone explain this?

A new northbound platform was built, with short lengths of tunnel either
side joining the new station tunnel to the original northbound tunnel.
Because of the need to keep the service running whilst the diversion work
was done, the junction tunnels were built outside the existing tunnel, which
was later demolished and, ultimately, the track diverted.

A similar diversion was done at London Bridge, where a new southbound
platform was constructed, though in this case the northernmost junction was
done differently due to the Thames being above (which also meant that the
line had to be closed for several months). Here, part of the old tunnel was
effectively filled in and the new tunnel bored from scratch, hence there is
no large-diameter junction tunnel there, though the change in tunnel lining
is obvious.


Also, judging by the size of the southbound platform, I'm assuming that
this
was where the original station was, and that the old northbound line was
covered up by the platform.

Correct. The station had a narrow island platform, like those which still
survive at Clapham Common and Clapham North.

If this is so, do the original NB tunnels still
exist behind the walls at the ends of the platform?

Yes. They are accessible through doors in the headwalls at both ends of the
(now) s/b platform. At the southern end of the station there used to be a
siding (though which part of the n/b diversion tunnel runs), and the
junction tunnel associated with that also still exists.

In article ,
(Heliomass) wrote:

I have a question that's been bugging me for some time. When you're
travelling northbound on the city branch of the Northern line, as you
approach Angel, the train appears to pass diagonally across an enlarged
section of tunnel (ie, an open space suddenly appears on one side and
as the
wall moves closer on approach to the station, the wall on the other
side of
the train seems to move away). Upon leaving the station, the same thing
happens in reverse. Can anyone explain this?

Also, judging by the size of the southbound platform, I'm assuming that
this
was where the original station was, and that the old northbound line was
covered up by the platform. If this is so, do the original NB tunnels
still
exist behind the walls at the ends of the platform?

Many thanks,

Daniel.



see:

http://www.romilepa.pwp.blueyonder.c.../stepplate.JPG

Originally posted to show a step-plate junction, this shows the basics of
the NB approach to Angel. The platforms are directly to the right of the
diagram.

There was also a similar diversion made for the Euston City platform.
Except that at Euston the original NB track (now known as the Euston
loop)was retained to give access to the SB platform.

At both Angel and Euston there was a siding off the platform to the right,
situated between the NB and SB running rails. At both stations the siding
was blocked off as the NB diversion passed through it at an angle. This is
still visible from the crossover when departing Euston SB.

Roger

wrote in message
...
In article ,
(Heliomass) wrote:

I have a question that's been bugging me for some time. When you're
travelling northbound on the city branch of the Northern line, as you
approach Angel, the train appears to pass diagonally across an enlarged
section of tunnel (ie, an open space suddenly appears on one side and
as the
wall moves closer on approach to the station, the wall on the other
side of
the train seems to move away). Upon leaving the station, the same thing
happens in reverse. Can anyone explain this?

Also, judging by the size of the southbound platform, I'm assuming that
this
was where the original station was, and that the old northbound line was
covered up by the platform. If this is so, do the original NB tunnels
still
exist behind the walls at the ends of the platform?

Many thanks,

Daniel.



see:

http://www.romilepa.pwp.blueyonder.c.../stepplate.JPG

Originally posted to show a step-plate junction, this shows the basics of
the NB approach to Angel. The platforms are directly to the right of the
diagram.

There was also a similar diversion made for the Euston City platform.
Except that at Euston the original NB track (now known as the Euston
loop)was retained to give access to the SB platform.

At both Angel and Euston there was a siding off the platform to the right,
situated between the NB and SB running rails. At both stations the siding
was blocked off as the NB diversion passed through it at an angle. This is
still visible from the crossover when departing Euston SB.

Roger

Thanks guys, that answers my questions!

Daniel.

When was there a siding at Angel? The present siding at Euston, which
connects the SB line with the NB and the loop to the Piccadilly
line, was originally the NB line. As far as I know there was previously no
siding at either location.
--
Lawrence Myers


wrote in message
...
In article ,
(Heliomass) wrote:

I have a question that's been bugging me for some time. When you're
travelling northbound on the city branch of the Northern line, as you
approach Angel, the train appears to pass diagonally across an enlarged
section of tunnel (ie, an open space suddenly appears on one side and
as the
wall moves closer on approach to the station, the wall on the other
side of
the train seems to move away). Upon leaving the station, the same thing
happens in reverse. Can anyone explain this?

Also, judging by the size of the southbound platform, I'm assuming that
this
was where the original station was, and that the old northbound line was
covered up by the platform. If this is so, do the original NB tunnels
still
exist behind the walls at the ends of the platform?

Many thanks,

Daniel.



see:

http://www.romilepa.pwp.blueyonder.c.../stepplate.JPG

Originally posted to show a step-plate junction, this shows the basics of
the NB approach to Angel. The platforms are directly to the right of the
diagram.

There was also a similar diversion made for the Euston City platform.
Except that at Euston the original NB track (now known as the Euston
loop)was retained to give access to the SB platform.

At both Angel and Euston there was a siding off the platform to the right,
situated between the NB and SB running rails. At both stations the siding
was blocked off as the NB diversion passed through it at an angle. This is
still visible from the crossover when departing Euston SB.

Roger

"Lawrence Myers" wrote in message
...
When was there a siding at Angel?

Full details on http://members.lycos.co.uk/raggajohn/northerndis.html.

The present siding at Euston, which
connects the SB line with the NB and the loop to the Piccadilly
line, was originally the NB line. As far as I know there was previously no
siding at either location.

Definitely sidings at both Angel and Euston. In both cases on the northbound
side, south of the station concerned. The disused tunnel can clearly be
seen at Euston, but only from trains travelling over the Euston Loop. The
one at Angel now forms part of the northbound diversion tunnel, and all
northbound trains travel through a section of it.

In message , Lawrence Myers
writes

When was there a siding at Angel?

Built in 1901 when the CSLR was extended to Islington. There was another
at Old Street (both long enough to hold an entire train).

The present siding at Euston, which connects the SB line with the NB
and the loop to the Piccadilly line, was originally the NB line. As far
as I know there was previously no siding at either location.

The Euston siding was built in 1907, when Euston became the new terminus
of the CSLR.

(all are mentioned in LU / Capital Transport's little book on The
Northern Line).

--
Paul Terry