On Sep 17, 7:20*am, asdf wrote:
On Mon, 15 Sep 2008 15:17:34 -0700 (PDT), MIG wrote:
As I understand it, it's shortage of rolling stock which needs the Euston
trains to go to Stratford. With fewer trains on a Sunday there are some
available to go to Euston.

I don't think it is lack of rolling stock, as there are sufficient
units spare (for starters, all three class 508s are available) to run
at least a Euston - Willesden Jcn shuttle. However, there would be a
probably be a lack of paths between Queens Park and Willesden Junction
due to the increased Bakerloo service at least during the peaks.-

I was just gonna say, presumably the 508s can't be used for any
services other than into Euston, and with so many lines closed, there
can't be a shortage.

Can't Watford Junction to Stratford be done entirely on DC? (There's a
dual-electrified stretch where the 313s normally switch to AC, but
presumably DC can still be used.)

(Not that there can possibly be a stock shortage. If there's enough
stock to run the normal Euston-Watford and NLL services, then there's
enough to run Euston-Watford as normal and Stratford to Willesden Jn
going via Primrose Hill instead of West Hampstead.)

The reason why the trains switch to AC is because trains using the DC
stretch along there would have to go at half power.

"somersetchris" wrote

The reason why the trains switch to AC is because trains using the DC
stretch along there would have to go at half power.

I suppose changing to AC at Dalston Kingsland and changing back at Hackney
Wick saves a minute in running time between those points. I suppose the
additional dwell time in changing between DC and AC at Dalston Kingsland and
Hackney Wick is about half a minute at each station.

Peter

In article
,
(somersetchris) wrote:

On Sep 17, 7:20*am, asdf wrote:
On Mon, 15 Sep 2008 15:17:34 -0700 (PDT), MIG wrote:
As I understand it, it's shortage of rolling stock which needs
the Euston trains to go to Stratford. With fewer trains on a
Sunday there are some available to go to Euston.

I don't think it is lack of rolling stock, as there are sufficient
units spare (for starters, all three class 508s are available) to
run at least a Euston - Willesden Jcn shuttle. However, there
would be a probably be a lack of paths between Queens Park and
Willesden Junction due to the increased Bakerloo service at
least during the peaks.-

I was just gonna say, presumably the 508s can't be used for any
services other than into Euston, and with so many lines closed,
there
can't be a shortage.

Can't Watford Junction to Stratford be done entirely on DC? (There's
a
dual-electrified stretch where the 313s normally switch to AC, but
presumably DC can still be used.)

(Not that there can possibly be a stock shortage. If there's enough
stock to run the normal Euston-Watford and NLL services, then there's
enough to run Euston-Watford as normal and Stratford to Willesden Jn
going via Primrose Hill instead of West Hampstead.)

The reason why the trains switch to AC is because trains using the DC
stretch along there would have to go at half power.

Isn't that just a general feature of the 313s? As built for the GN they
ran in series only on DC because the Northern City Line section is
limited to 30 MPH anyway. It doesn't affect the 508s and I thought the
313s transferred to the NLL/Euston Watford Service were modified.

--
Colin Rosenstiel

On Sep 17, 4:34*pm, (Colin Rosenstiel) wrote:
In article
,







(somersetchris) wrote:
On Sep 17, 7:20*am, asdf wrote:
On Mon, 15 Sep 2008 15:17:34 -0700 (PDT), MIG wrote:
As I understand it, it's shortage of rolling stock which needs
the Euston trains to go to Stratford. With fewer trains on a
Sunday there are some available to go to Euston.

I don't think it is lack of rolling stock, as there are sufficient
units spare (for starters, all three class 508s are available) to
run at least a Euston - Willesden Jcn shuttle. However, there
would be a probably be a lack of paths between Queens Park and
Willesden Junction due to the increased Bakerloo service at
least during the peaks.-

I was just gonna say, presumably the 508s can't be used for any
services other than into Euston, and with so many lines closed,
there
can't be a shortage.

Can't Watford Junction to Stratford be done entirely on DC? (There's
a
dual-electrified stretch where the 313s normally switch to AC, but
presumably DC can still be used.)

(Not that there can possibly be a stock shortage. If there's enough
stock to run the normal Euston-Watford and NLL services, then there's
enough to run Euston-Watford as normal and Stratford to Willesden Jn
going via Primrose Hill instead of West Hampstead.)

The reason why the trains switch to AC is because trains using the DC
stretch along there would have to go at half power.

Isn't that just a general feature of the 313s? As built for the GN they
ran in series only on DC because the Northern City Line section is
limited to 30 MPH anyway. It doesn't affect the 508s and I thought the
313s transferred to the NLL/Euston Watford Service were modified.


Yes, I think this is the case. The Northern City trains are limited to
30 mph in the tunnels anyway. I don't think that there is any
difference in the power available under DC or AC. If there was any DC
speed limiters on the original units, they have certainly been removed
from the NLL units.

In article
,
(Andy) wrote:

On Sep 17, 4:34*pm, (Colin Rosenstiel) wrote:
In article
,
(somersetchris) wrote:

The reason why the trains switch to AC is because trains using the
DC stretch along there would have to go at half power.

Isn't that just a general feature of the 313s? As built for the GN
they ran in series only on DC because the Northern City Line section
is limited to 30 MPH anyway. It doesn't affect the 508s and I thought

the 313s transferred to the NLL/Euston Watford Service were modified.

Yes, I think this is the case. The Northern City trains are limited to
30 mph in the tunnels anyway. I don't think that there is any
difference in the power available under DC or AC. If there was any DC
speed limiters on the original units, they have certainly been removed
from the NLL units.

I don't think there was anything to "remove". The DC controls were
series-only. They would have had to be modified for full series-parallel
control, something not quite so simple.

--
Colin Rosenstiel