Northern Line Indicator Boards
 

Zac wrote:
www.runnersneed.co.uk
"Brimstone" wrote in message
...
Zac wrote:
Several times in the last week (about 0810), the indicator boards at
Totteridge and Whetstone have shown :

1) Morden via Bank
2) Kennington via Charing Cross
3) Morden via Bank


The CX train then changes to "not in service", when this train
arrives it has "not in service" displayed on the front, but already
has passengers on boards, and lets on at T&W. It then changes to a
labelled CX train at West Finchley, and carries through to
Kennington.

Has happened 3 times in the last 10 days or so at about the same
time. Any ideas why ?

Could it be to try to stop people boarding at T&W and WP, and let
WF's passengers get a seat ?

Why do you assume it's deliberate? Does it not occur to you it might
simply be a fault that the technicians haven't been able to fix yet?

Mr Brimstone

Ok, I'm very sorry, may be it is a fault which the technicians have
not been able to fix.
I was only offering an idea up for discussuion/thoughts for the
newsgroup.

It did actually occur that it may be a fault, but am I not able to
offer any sort of ideas myself ?

The tone of your posting suggested that this was a deliberate feature, hence
my question. I was merely seeking clarification, is that not allowed?

Northern Line Indicator Boards
 

Northern Line Indicator Boards
 

In article ,
(Clive D. W. Feather) wrote:

In article ,
writes
If the train's got "Not In Service" on the front of the train, then
that's something that the driver sets up via a switch in the cab. It
may
be that that end of the train had been out of service on a previous
trip
and hadn't been put back.

Could it then be that the driver's taking a station or two to notice
the "Not in service" on the station signs as he comes in? As soon as he
does, he fixes the display in the train (and the PTI then updates the
indicators).

--
Clive D.W. Feather | Home:
Tel: +44 20 8495 6138 (work) | Web: http://www.davros.org
Fax: +44 870 051 9937 | Work:
Please reply to the Reply-To address, which is:

It could be. The new PTI information (i.e. the switch returned to normal)
would be picked up at the next interrogator - normally either just before
or just after the next controlled area.

The other thing is that it could just be a fault with the PTI equipment
itself that is causing the problem. I've had a few of these intermittent
not in service displays for no apparent reason.

Once a destination is picked up and transmitted (e.g. as the train leaves
Tooting Broadway NB), the same destination should always be shown at all
the stations until the next PTI interrogator (in this case, Oval as any
changes are picked up after the train leaves Stockwell). Where the
destination (or lack of it) varies from station to station within a
section, then this is definitely a PTI related fault.

Roger

Northern Line Indicator Boards
 

Helen Deborah Vecht wrote in message ...
My nearest station is Burnt Oak, which is the first stop after
Edgware
on the other northern fringe of the Northern Line.

My rule of thumb is "If three trains are indicated and the first is more
than 3 minutes away, CORRECTION will flash up before a train arrives."
It is seldom wrong.

Edgware is less than 3 minutes away, which might have something to do with it.

Indeed -- I remember the same at Colindale when I worked there (except
there it's more likely to be 5-6 minutes, so it happens less
frequently).

What's strange is that IIRC the indicators at Edgware itself were
generally reasonably accurate. For some reason the downline indicators
weren't following the Edgware ones.

Northern Line Indicator Boards
 

In article ,
(Alistair Bell) wrote:

Helen Deborah Vecht wrote in message
...
My nearest station is Burnt Oak, which is the first stop after
Edgware
on the other northern fringe of the Northern Line.

My rule of thumb is "If three trains are indicated and the first is
more
than 3 minutes away, CORRECTION will flash up before a train arrives."
It is seldom wrong.

Edgware is less than 3 minutes away, which might have something to do
with it.

Indeed -- I remember the same at Colindale when I worked there (except
there it's more likely to be 5-6 minutes, so it happens less
frequently).

What's strange is that IIRC the indicators at Edgware itself were
generally reasonably accurate. For some reason the downline indicators
weren't following the Edgware ones.

The Signalmen will often set up the description at the termini, the rest
is done by the train. Having said that, the describers at Edgware often
show the wrong description through no fault of the Signalman or driver!

Roger

Northern Line Indicator Boards
 

Helen Deborah Vecht wrote in message ...
(Kevin)typed

Brent Cross has been showing incorrect information for a few weeks now
aswell.

A FEW WEEKS? Anything north of Hampstead has shown duff information for
as long as I can remember!

Well, at least since 1988.

Indeed. When I used to live near and commute on the northern line back in
the mid 90s the only thing you could rely on with the indicators is that
you couldn't rely on them! The only use they had was to inform us that yes
there was a train coming at some point if we waited! :)

B2003