Northern Line this week
 

What is going on, pretty much all this week delays etc.

Yesterday late engineering works led to severe delays *all day*.

Today severe delays due to non-availability of trains??

Northern Line this week
 

There is an intermitten problem with the trains, they are being checked
by fleet staff at Alstom. Station staff are being used to ride in the
cab as well, to "double man".

Northern Line this week
 

The tripcocks are defective and may not operate when a train is
'tripped' at slow speed. The news is being 'sat on' with delays put
down to 'signal failures'.

Northern Line this week
 

On Sun, 18 Sep 2005 15:12:18 -0700, bowroaduk wrote:

The tripcocks are defective and may not operate when a train is 'tripped'
at slow speed. The news is being 'sat on' with delays put down to 'signal
failures'.

Interesting, for what reason? One could suspect that they are trying to
justify their second closure of the Bank branch for the second attempt at
fixing it.

Northern Line this week
 

In article . com,
() wrote:

The tripcocks are defective and may not operate when a train is
'tripped' at slow speed. The news is being 'sat on' with delays put
down to 'signal failures'.


The tripcocks are being tested by the trains passing a raised trainstop
at the approach to the termini. As a consequence, this totally messes up
the service and a special reduced service is generally in operation. There
is also a shortage of trains because the depot needs them as the tripcocks
are also being checked out in depot by depot staff.

Roger

Northern Line this week
 

In message ,
writes
The tripcocks are defective and may not operate when a train is
'tripped' at slow speed. The news is being 'sat on' with delays put
down to 'signal failures'.


The tripcocks are being tested by the trains passing a raised trainstop
at the approach to the termini. As a consequence, this totally messes
up the service and a special reduced service is generally in operation.
There is also a shortage of trains because the depot needs them as the
tripcocks are also being checked out in depot by depot staff.
What's happened to the trip testers like the one that used to be at
Leicester Sq.? Are these no longer in use?
--
Clive

Northern Line this week
 

The normal testers only check that the tripcock is 1) in place, 2) in
gauge - the present problem was caused when a train was tripped
travelling at slow speed (not "in slow speed") and the tripcock
effectively reset itself, thus failed to operate the Tripcock Pressure
Switch which applies the brakes.

Northern Line this week
 

In message .com,
writes
The normal testers only check that the tripcock is 1) in place, 2) in
gauge - the present problem was caused when a train was tripped
travelling at slow speed (not "in slow speed") and the tripcock
effectively reset itself, thus failed to operate the Tripcock Pressure
Switch which applies the brakes.

So it's a single train problem as once tripped the tripcock should stay
tripped until reset.
--
Clive

Northern Line this week
 

That's what's not happening - the tripcock was pushed back by the
raised trainstop but then sprang back to the vertical position rather
than latch up and allow the main line air to vent (thus operating the
pressure switch). Had the train been tripped at a faster speed, a good
'whack' would have ensured the tripcock was knocked back and up.

Seems odd that the Jubilee Line has not been forced to double-man
trains too, or indeed that HRMI haven't 'grounded' the whole 1995/96TS
as was done with the 1992TS after Chancery Lane.

Northern Line this week
 

In message .com,
writes
and allow the main line air to vent (
Shouldn't this read "Train Line" instead of Main line?
--
Clive