wrote in message
...
In article

rg, (Recliner) wrote:

wrote:
In article ,
(Richard) wrote:


I suppose the other question is in which direction? Are they
switching at different locations Northbound and Southbound?

Yes, I wondered about that, but from my observations, it's the same both
ways (ie, City Thameslink).

I wonder why some trains change at Farringdon then?


I thought it was panto up at CTK and down at ZFD, the idea being that it's
easier to reverse or (at CTK) dispose of a train to the sidings in the event
of problems with the changeover. I don't think any of the crossovers or
sidings at/adjacent to CTK are wired, which will influence the decision.
There are times when CTK is closed so I imagine it's easier to do the
changeover at ZFD.

--
DAS

On 07/11/2014 11:19, Basil Jet wrote:
[...]
I wonder why some trains change at Farringdon then?

Dunno. Maybe they are expected to keep up to speed with changes at both
stations?

The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way
of the other trains. Farringdon of course used to have the
dual-electrified Moorgate Branch as a place to hide trains with stuck
pantographs, but lost that when the platforms were extended over the
junction (which I presume has happened by now), so I'd be very surprised
if any trains were still changing power at Farringdon.

You haven't been to see Farringdon lately, Joh... I mean Mr, er, Jet -
well you must. Interesting changes.

Basil Jet wrote:
On 2014\11\07 10:16, Recliner wrote:
wrote:

I wonder why some trains change at Farringdon then?

Dunno. Maybe they are expected to keep up to speed with changes at both
stations?

The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way of
the other trains. Farringdon of course used to have the dual-electrified
Moorgate Branch as a place to hide trains with stuck pantographs, but
lost that when the platforms were extended over the junction (which I
presume has happened by now), so I'd be very surprised if any trains were
still changing power at Farringdon.

The Moorgate City Widened line closed almost five years ago!

On 2014\11\07 13:12, Recliner wrote:
Basil Jet wrote:
On 2014\11\07 10:16, Recliner wrote:
wrote:

I wonder why some trains change at Farringdon then?

Dunno. Maybe they are expected to keep up to speed with changes at both
stations?

The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way of
the other trains. Farringdon of course used to have the dual-electrified
Moorgate Branch as a place to hide trains with stuck pantographs, but
lost that when the platforms were extended over the junction (which I
presume has happened by now), so I'd be very surprised if any trains were
still changing power at Farringdon.

The Moorgate City Widened line closed almost five years ago!

The line closed, yes, but I'm not sure exactly when the Farringdon
platforms were extended over the tracks. I've used the Underground very
rarely in the last 10 years.

Basil Jet wrote:
On 2014\11\07 13:12, Recliner wrote:
Basil Jet wrote:
On 2014\11\07 10:16, Recliner wrote:
wrote:

I wonder why some trains change at Farringdon then?

Dunno. Maybe they are expected to keep up to speed with changes at both
stations?

The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way of
the other trains. Farringdon of course used to have the dual-electrified
Moorgate Branch as a place to hide trains with stuck pantographs, but
lost that when the platforms were extended over the junction (which I
presume has happened by now), so I'd be very surprised if any trains were
still changing power at Farringdon.

The Moorgate City Widened line closed almost five years ago!

The line closed, yes, but I'm not sure exactly when the Farringdon
platforms were extended over the tracks. I've used the Underground very
rarely in the last 10 years.

The junction was removed immediately, and the lengthened platforms have
been in use for most of those five years.

On 07/11/2014 13:55, Recliner wrote:

Basil Jet wrote:
[...]
The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way of
the other trains. Farringdon of course used to have the dual-electrified
Moorgate Branch as a place to hide trains with stuck pantographs, but
lost that when the platforms were extended over the junction (which I
presume has happened by now), so I'd be very surprised if any trains were
still changing power at Farringdon.

The Moorgate City Widened line closed almost five years ago!

The line closed, yes, but I'm not sure exactly when the Farringdon
platforms were extended over the tracks. I've used the Underground very
rarely in the last 10 years.

The junction was removed immediately, and the lengthened platforms have
been in use for most of those five years.


It's not been as long as that - the extended platforms opened winter of
2011-2012 I think, so coming up to three years.

On Thu, 06 Nov 2014 16:33:29 -0600,
wrote:

In article ,
(Richard) wrote:
BTW I'm sure I've seen -- well, experienced in the form of a "reboot"
-- the pan go down at Farringdon s/b. This was on an Electrostar,
maybe they're different?

When though? We were told elsewhere in this thread that the change was only
made about 6 months ago.

It happened again tonight (7/11/14)... I think it is as DAS says, the
changeover is done at CTK n/b and ZFD s/b, to give a chance to take
out-of-service (reverse) a train that can't effect the changeover for
whatever reason.

Richard.

In article ,
(Richard) wrote:

On Thu, 06 Nov 2014 16:33:29 -0600,
wrote:

In article ,
(Richard) wrote:
BTW I'm sure I've seen -- well, experienced in the form of a "reboot"
-- the pan go down at Farringdon s/b. This was on an Electrostar,
maybe they're different?

When though? We were told elsewhere in this thread that the change was
only made about 6 months ago.

It happened again tonight (7/11/14)... I think it is as DAS says, the
changeover is done at CTK n/b and ZFD s/b, to give a chance to take
out-of-service (reverse) a train that can't effect the changeover for
whatever reason.

Have they installed crossovers? None are shown in the vicinity of either
station in the 2012 London Railway Atlas.

--
Colin Rosenstiel

On Fri, 07 Nov 2014 18:28:56 -0600,
wrote:

In article ,
(Richard) wrote:

It happened again tonight (7/11/14)... I think it is as DAS says, the
changeover is done at CTK n/b and ZFD s/b, to give a chance to take
out-of-service (reverse) a train that can't effect the changeover for
whatever reason.

Have they installed crossovers? None are shown in the vicinity of either
station in the 2012 London Railway Atlas.

I think there is a trailing crossover, at least, between the two
stations, which doesn't really explain why the changeover isn't still
done at CTK going south. Going north, there are a few sidings that
could be used, as well as a reversal at ZFD.

Richard.

On Fri, 07 Nov 2014 11:19:53 +0000, Basil Jet
wrote:

The plan in the TL2000 documents was to do all changeovers at City
instead of Farringdon, because the dual-electrified sidings at City can
be used to get trains with pantographs stuck up or down out of the way
of the other trains. Farringdon of course used to have the
dual-electrified Moorgate Branch as a place to hide trains with stuck
pantographs, but lost that when the platforms were extended over the
junction (which I presume has happened by now), so I'd be very surprised
if any trains were still changing power at Farringdon.

It certainly has happened! Odd to stand on a part of platform that
used to be an open-air junction.

And as mentioned elsewhere on the thread, the changeover can/does
happen at Farringdon, and that's OK, because the wires extend to City,
so there is still access to the sidings.

Richard.