I've seen out of service trains reverse at Euston (Bank) but why would
they reverse an inservice train. At 7.30 this morning I crossed from
Camden CX branch to HB branch and the first train was going to Euston
only. No problems for me as I wanted the Victoria Line but this seemed
an odd thing to do.

Kevin

wrote:
I've seen out of service trains reverse at Euston (Bank) but why
would they reverse an inservice train. At 7.30 this morning I
crossed from Camden CX branch to HB branch and the first train was
going to Euston only. No problems for me as I wanted the Victoria
Line but this seemed an odd thing to do.


Which direction was the train headed when you saw that it was
terminating? North to south reversals, where the train approaches
Euston from Bank, are not especially difficult, due to the special
nature of the Euston Loop. North to south reversals, where the train
approaches from Camden and then returns to Camden, might be a little
more involved.

Train reversals such as this one are usually done when the Line
Controller is reforming the service due to disruption; the Euston Loop
is especially useful because it allows Bank branch trains to traverse
the entire branch, then reverse without crossing the junctions at
Camden.

This was a southbound train. Considering the delay to the service,
bearing in mind that was right at the start of the rush hour, that this
entailed it hardly seemed worth it. I was not aware that there had been
any disruption but then I had cone down from Brent X and this train had
come from the HB direction.
Kevin

TheOneKEA wrote:

Train reversals such as this one are usually done when the Line
Controller is reforming the service due to disruption; the Euston Loop
is especially useful because it allows Bank branch trains to traverse
the entire branch, then reverse without crossing the junctions at
Camden.

Euston Loop? Can you tell us more about this?

Brimstone wrote:
Euston Loop? Can you tell us more about this?

Back in the days when the Bank branch platforms of the Northern Line at
Euston were either face of an island platform (like Clapham Common),
there was a scissors crossover south of the platforms to allow C&SLR
trains to reverse south to Kennington and Clapham. When the C&SLR was
connected to the CCE&HR at Camden Town and the Charing Cross/Bank
branches formed, the scissors geometry was simplified to a single
trailing crossover. Later, a link was installed between the NB tunnel
and the Piccadilly Line; this is the Kings Cross Loop, and is the only
track connection (out of two planned*) between the Northern and the
rest of the LU combine.

When the Victoria Line arrived, the NB track of the Northern Line, Bank
branch, was diverted quite a distance south of Euston into a new
alignment, and the Victoria Line brought between the two lines,
facilitating cros-platform interchange. However, the presence of the
trailing crossover was deemed to be too useful to the line, so instead
of filling in the original NB tunnel north of the divergence, a
step-plate junction was built.

Now, a NB train gets a feather to enter the original NB tunnel, travel
across the crossover and stop in Euston Bank branch SB platform, where
they change ends and head off towards Kennington and Morden.


* - the other one was a planned connection between the Bakerloo and the
CCE&HR extension between Waterloo and Kennington; later it was
downgraded to a non-track connection, and then later forgotten. I could
be wrong about this though.

What is a spep plate junc.

Kevin

wrote:
What is a spep plate junc.

Kevin

contains a good explanation.

That would of course be - add the
chevrons when searching.

"TheOneKEA" wrote in message
ups.com...
Brimstone wrote:
Euston Loop? Can you tell us more about this?

Back in the days when the Bank branch platforms of the Northern Line at
Euston were either face of an island platform (like Clapham Common),
there was a scissors crossover south of the platforms to allow C&SLR
trains to reverse south to Kennington and Clapham. When the C&SLR was
connected to the CCE&HR at Camden Town and the Charing Cross/Bank
branches formed, the scissors geometry was simplified to a single
trailing crossover. Later, a link was installed between the NB tunnel
and the Piccadilly Line; this is the Kings Cross Loop, and is the only
track connection (out of two planned*) between the Northern and the
rest of the LU combine.

Interesting explanation snipped

So it's not a loop as in the case of Kennington or Heathrow loops merely a
connection to the Piccadilly with a reversing facility?

Brimstone wrote:

Interesting explanation snipped

So it's not a loop as in the case of Kennington or Heathrow loops
merely a
connection to the Piccadilly with a reversing facility?

Precisely.