Re: Headways and capacity in "Delivering a sustainable railway"

On Sat, 28 Jul 2007 02:19:23 +0100 someone who may be asdf
<invalid@xxxxxxxxxxxxxxx> wrote this:-

What about having a cable connected through the train, attached to a
transponder on the rear vehicle, which is queried every second or so?
If there is no response then a split is assumed, and the train stops
updating its position to control.

There is already a suitable "cable", the brake pipe. The computer on
the train will know whether the driver has applied the brake or not,
if the driver has not applied the brake and the brake pipe goes
rapidly to atmospheric pressure then the train is probably divided.

What happens next doesn't depend on communication between train and
control centre. If the train cannot communicate with the control
centre then the latter will not have a confirmation from the train
that it has advanced. Therefore it will not advance the stop point
for a following train, as you said in your posting. If there is
communication then the train can indicate that it is divided, as
part of a whole lot of other data about what has happened.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54
.

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