On Feb 26, 11:32*pm, Charles Ellson
wrote:
On Sun, 26 Feb 2012 03:25:57 -0800 (PST), 77002
wrote:





On Feb 26, 11:00*am, wrote:
In article
,

(77002) wrote:
On Feb 25, 10:53*pm, Charles Ellson wrote:
On Sat, 25 Feb 2012 01:44:48 -0800 (PST), lonelytraveller

wrote:
On Feb 25, 9:21*am, Charles Ellson wrote:
On Sat, 25 Feb 2012 00:01:32 -0800 (PST), lonelytraveller

wrote:
On Feb 23, 11:14*am, "Peter Masson"
wrote:
"burkey" wrote

Plans to start Croxley Rail Link services in 2016

The formal (Railways Act 2005) closure notice for Watford LUL
station has now been published. Any objections must be in by 12
April, though actual closure will not take place until the
Croxley Link is open, expected in 2016.

Why didn't they run a parliamentary "replacement bus service",
instead? It worked for network southeast, with the croxley line.

That was a tactic to avoid having to run trains, not something that
applies in the case of the Croxley Link except when work requires it.

It avoids having to run trains to Watford (cassiobury park) Station.
And especially avoids having to pay lip service to criticism from the
locals.

If services to Watford continue until transfer day and Watford High
Street and Watford Junction become the official replacements for
Watford Met. then there is no service to be bustituted. Unless there
is a practical restriction on doing so, services to Watford Met. could
continue with a temporary junction at the diversion point to allow an
overnight change of timetabled services or a temporary delay of
diversion if something unforeseen** crops up with running Met. trains
in passenger service into Watford Junction.

This is an expense I doubt Hertford County, TfL, et al will want to
incurr.

** There will presumably be a NR/LU train detector at Watford High
Street to stop trains going the wrong way or will Gunnersbury-style
cockups still be possible ?.

IMHO The latter. * LUL Trains could be stopped utilizing their
tripcock. *I do not know if Overground trains have any AWS.

Don't they have tripcocks for the tracks shared with the Bakerloo?

You are most certainly correct. *So there is, under currently
installed technology, no automated way to prevent Met, trains being
routed over the "DC" lines, or Overground trains being routed towards
Moor Park.

The line isn't installed yet never mind any technology but relevant
technology is already in use elsewhere; a train cannot be signalled
from the DC line to LU at Queens Park if it does not pass current
through the 4th rail.
Similar methods can prevent an LU train going to 3rd rail territory
but are AFAIAA not currently used anywhere, possibly because the
consequences are non-destructive (except for the timetable). For new
work other technology such as e.g. identification transponders could
achieve the same job.

One is aware that transponders could solve this problem. However,
AFAIK, LUL have yet to utilize such technology for the above stated
purpose.