On Mar 14, 2:39*pm, MIG wrote:
On Mar 14, 2:07*pm, wrote:





On Mar 14, 1:42*pm, wrote:

"Jack Taylor" wrote in message

...

wrote:

They might well put up platform protection for staff working on the
station - but I would imagine that the normal 5mph limit through the
station will apply. Allowing trains to pass through faster would cause
chaos with the timetables, not som much on the central section where all
trains are doing the same but on the branches where other services
interface.

I did not think that there was much interface with service on other
branches, really. Can you give some examples, out of curiosity?

Hammersmith and City from Aldgate East, Piccadilly Line at Acton Town
- Ealing Common (and from Hammersmith occasionally), North London Line
Gunnersbury - Richmond, ECS South West Trains Wimbledon - Putney. I
think that the killer spot would be Aldgate East, arriving early there
would cause the most problems.

I find it hard to believe that the timing of the service is all that
precise in practice. *My impression is that they always wait around
anyway, at Aldgate East, Earls Court and just about anywhere.


Underground working times are in half minute blocks and yes, the
timing are that precise for the working timetables. Of course,
individual trains won't all run exactly to the timings, but they
should be close. Trains hang about at the junctions partly because of
the slack in the timetables, allowing trains to run an extra minute
faster, means that this minute has to be lost before the junction or
the interacting service has to be retimed as well. The District line
is particularly hard to timetable, due to the interactions on the
branches and the knock on effects on the H&C and Met lines.

More likely, it would add a tiny bit of recovery potential to the line
if they could run through at greater speed.

But is it worth the cost of the alterations to the signalling? You get
more recovery time from not actually stopping and opening / closing
the doors than you can from increasing speed through the station from
the approach control speed to, say, 30 mph.