I was on a Victoria Line train this evening, and about two seconds after
it set off there was an emergency stop. The driver came on the PA with a
very sarcastic comment that "that's what happens when people don't heed
the warnings about getting their personal effects trapped in doors".

But surely the train shouldn't be able to set off at all, in those
circumstances?
--
Roland Perry

On Oct 25, 6:50*pm, Roland Perry wrote:
But surely the train shouldn't be able to set off at all, in those
circumstances?

Is it not that the train can run at a very low speed, and on exceeding
that the brakes come on?

Maybe I'm wrong. Someone with more knowhow is bound to come along in
a mo...

PhilD

--

On 25/10/2012 20:54, PhilD wrote:
On Oct 25, 6:50 pm, Roland Perry wrote:
But surely the train shouldn't be able to set off at all, in those
circumstances?

Is it not that the train can run at a very low speed, and on exceeding
that the brakes come on?

Maybe I'm wrong. Someone with more knowhow is bound to come along in
a mo...

PhilD

--


LU trains trains will simply not take power if the passenger door
circuits are not closed, unless the driver has cut in the interlocking.
They might lurch for a second in some cases, depending on the model, but
that's because of relays cutting in and out for a sec.

(D78s and I think C69s will operate with the cab doors open, and without
the interlocking engaged, though I don't know if the same applies on
other models.)

This principle of door safety is also applicable on many other EMU class
trains, though there are exceptions.

In message
, at
12:54:40 on Thu, 25 Oct 2012, PhilD remarked:
But surely the train shouldn't be able to set off at all, in those
circumstances?

Is it not that the train can run at a very low speed, and on exceeding
that the brakes come on?

We set off as normal and after about two seconds slammed to a halt.
--
Roland Perry

On Thu, 25 Oct 2012 18:49:44 +0100, Roland Perry wrote:

I was on a Victoria Line train this evening, and about two seconds after
it set off there was an emergency stop. The driver came on the PA with a
very sarcastic comment that "that's what happens when people don't heed
the warnings about getting their personal effects trapped in doors".

But surely the train shouldn't be able to set off at all, in those
circumstances?

It depends on the door edge detection system, and what's triggered the
stop. The stop may have been triggered by someone yanking the trapped
item and triggering the detection system, although I seem to recall
reading in something that may have emanated from either RAIB or industry
that the detection systems are meant to detect down to layers of material
(So 1mm - 5mm ish thicknesses) (possibly this was a future development?)
to prevent people being dragged along platforms by trapped clothes.

Rgds

Denis McMahon

On 2012-10-25 20:16:25 +0000, Denis McMahon said:

On Thu, 25 Oct 2012 18:49:44 +0100, Roland Perry wrote:

I was on a Victoria Line train this evening, and about two seconds after
it set off there was an emergency stop. The driver came on the PA with a
very sarcastic comment that "that's what happens when people don't heed
the warnings about getting their personal effects trapped in doors".

But surely the train shouldn't be able to set off at all, in those
circumstances?

It depends on the door edge detection system, and what's triggered the
stop. The stop may have been triggered by someone yanking the trapped
item and triggering the detection system, although I seem to recall
reading in something that may have emanated from either RAIB or industry
that the detection systems are meant to detect down to layers of material
(So 1mm - 5mm ish thicknesses) (possibly this was a future development?)
to prevent people being dragged along platforms by trapped clothes.

Rgds

Denis McMahon

The RAIB report on a Vic Line starting with the doors open gives more
detail than you could possibly digest in a single sitting.
http://www.raib.gov.uk/latest_news/n...ren_street.cfm