On Sun, 17 Jul 2005 20:03:53 +0100 someone who may be "RPM"
wrote this:-

Only the tripcock on the leading vehicle is "active" on a 165/168.

If two units are coupled together the tripcocks on the two cabs that are
coupled tend to trip but this does not prevent the train from moving.

That probably/possibly involves the tripcock arms on the rear units
regularly striking a trackside trainstop arm at considerable speed,
once on each trip. This will be where the train enters the area
fitted with LT signalling. That can't be good for the life of the
arms and they are likely to break off at the point when they need to
work.

It would be better for the arms to be automatically moved out of the
way when coupled up.


--
David Hansen, Edinburgh | PGP email preferred-key number F566DA0E
I will always explain revoked keys, unless the UK government
prevents me by using the RIP Act 2000.

Erm, Roger is a driver at Chiltern. Who signs 165's and 168's.
He knows what he is talking about!

On 17 Jul 2005 13:16:20 -0700 someone who may be "Minna Daisuki
Katamari Damacy" wrote this:-

Erm, Roger is a driver at Chiltern. Who signs 165's and 168's.
He knows what he is talking about!

None of which is an answer to the points I raised.


--
David Hansen, Edinburgh | PGP email preferred-key number F566DA0E
I will always explain revoked keys, unless the UK government
prevents me by using the RIP Act 2000.

"David Hansen" wrote in message
...
On Sun, 17 Jul 2005 20:03:53 +0100 someone who may be "RPM"
wrote this:-

Only the tripcock on the leading vehicle is "active" on a 165/168.

If two units are coupled together the tripcocks on the two cabs that are
coupled tend to trip but this does not prevent the train from moving.

That probably/possibly involves the tripcock arms on the rear units
regularly striking a trackside trainstop arm at considerable speed,
once on each trip. This will be where the train enters the area
fitted with LT signalling. That can't be good for the life of the
arms and they are likely to break off at the point when they need to
work.

It would be better for the arms to be automatically moved out of the
way when coupled up.


I am advised that the trip arm/s on trailing units stays down until it
strikes a trackside obstruction. Since it is swtiched out of the circuit
there is no effect when that happens. It is automatically reset when
uncoupling.

David Hansen wrote:
On Sun, 17 Jul 2005 20:03:53 +0100 someone who may be "RPM"
wrote this:-

Only the tripcock on the leading vehicle is "active" on a 165/168.

If two units are coupled together the tripcocks on the two cabs that
are coupled tend to trip but this does not prevent the train from
moving.

That probably/possibly involves the tripcock arms on the rear units
regularly striking a trackside trainstop arm at considerable speed,
once on each trip. This will be where the train enters the area
fitted with LT signalling. That can't be good for the life of the
arms and they are likely to break off at the point when they need to
work.

It would be better for the arms to be automatically moved out of the
way when coupled up.

Two points.
Firstly, LT trains work in the same way and I am not aware that they have
had problems.
Secondly, Once a tripcock is struck it remains in the up position until it
is reset when the unit is uncoupled so the rear unit tripcock will only be
hit once per period of time that the unit is coupled as the non leading
unit.


--
Cheers for now,

John from Harrow, Middx

remove spamnocars to reply

Two points.
Firstly, LT trains work in the same way and I am not aware that they have
had problems.
Secondly, Once a tripcock is struck it remains in the up position until
it
is reset when the unit is uncoupled so the rear unit tripcock will only be
hit once per period of time that the unit is coupled as the non leading
unit.

The only difference being that the LUL trains will get strike the first
signal they encouter leaving the depot at 10mph whilst the Chiltern units
similiar first experience will be a signal at 75mph!

Andyh

In reply to news post, which Andy H
wrote on Mon, 18 Jul 2005 -
Two points.
Firstly, LT trains work in the same way and I am not aware that they have
had problems.
Secondly, Once a tripcock is struck it remains in the up position until
it
is reset when the unit is uncoupled so the rear unit tripcock will only be
hit once per period of time that the unit is coupled as the non leading
unit.

The only difference being that the LUL trains will get strike the first
signal they encouter leaving the depot at 10mph whilst the Chiltern units
similiar first experience will be a signal at 75mph!

Andyh


The are trip cock testers at Amersham and Harrow. The Chiltern trains
have to pass these OK and they are done at slow speed, even if the train
is not stopping. I'm not sure what happens to the tester once the first
unit has gone past, but in theory it could trigger the second units arm
out of the way. Also, when the A60 stock was first introduced, they
would run 4 car sets off peak, at that time all cabs I assume would have
been driveable, so a similar situation to the 16/168 situation may have
occurred then, i.e. the second unit potentially being tripped at speed,
I assume they solved this!
--
Matthew P Jones - www.amersham.org.uk
My view of the Metropolitan Line www.metroland.org.uk - actually I like it
Don't reply to it will not be read
You can reply to knap AT Nildram dot co dot uk

"

The are trip cock testers at Amersham and Harrow. The Chiltern trains
have to pass these OK and they are done at slow speed, even if the train
is not stopping. I'm not sure what happens to the tester once the first
unit has gone past, but in theory it could trigger the second units arm
out of the way. Also, when the A60 stock was first introduced, they would
run 4 car sets off peak, at that time all cabs I assume would have been
driveable, so a similar situation to the 16/168 situation may have
occurred then, i.e. the second unit potentially being tripped at speed, I
assume they solved this!
--
Matthew P Jones - www.amersham.org.uk
My view of the Metropolitan Line www.metroland.org.uk - actually I like
it
Don't reply to it will not be read
You can reply to knap AT Nildram dot co dot uk

Except that the Chiltern units have already encountered a Tripcock fitted
signal well in advance of both Amersham and Harrow as they enter the Met
territory. Both of these are approached at speed.

Andyh

On Mon, 18 Jul 2005 19:38:12 +0100, "Andy H"
wrote:

Two points.
Firstly, LT trains work in the same way and I am not aware that they have
had problems.
Secondly, Once a tripcock is struck it remains in the up position until
it
is reset when the unit is uncoupled so the rear unit tripcock will only be
hit once per period of time that the unit is coupled as the non leading
unit.

The only difference being that the LUL trains will get strike the first
signal they encouter leaving the depot at 10mph whilst the Chiltern units
similiar first experience will be a signal at 75mph!

Surely they'd be moving slowly, having just stopped at
Amersham/Harrow-on-the-Hill? In any case I don't think 75mph is
permitted on the LUL track!

"asdf" wrote in message
...
On Mon, 18 Jul 2005 19:38:12 +0100, "Andy H"
wrote:

Two points.
Firstly, LT trains work in the same way and I am not aware that
they have
had problems.
Secondly, Once a tripcock is struck it remains in the up
position until
it
is reset when the unit is uncoupled so the rear unit tripcock will
only be
hit once per period of time that the unit is coupled as the non
leading
unit.

The only difference being that the LUL trains will get strike the
first
signal they encouter leaving the depot at 10mph whilst the Chiltern
units
similiar first experience will be a signal at 75mph!

Surely they'd be moving slowly, having just stopped at
Amersham/Harrow-on-the-Hill? In any case I don't think 75mph is
permitted on the LUL track!

Towards Amersham, from Aylesbury, the trains enter LUL track at,
presumably, 60mph at "Mantles Wood Junction".
Where is the first LUL signal with trip after the junction and before
Amersham station, presumably before the siding line into the main
london bound platform at Amersham... but how close, as the trains will
still be travelling at some speed at that point.