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Old January 28th 20, 09:05 AM posted to uk.railway,uk.transport.london
Anna Noyd-Dryver Anna Noyd-Dryver is offline
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First recorded activity at LondonBanter: Jan 2015
Posts: 243
Default Excellent picture of a broken rail following a derailment

wrote:
On Mon, 27 Jan 2020 15:48:32 +0000
Basil Jet wrote:
On 27/01/2020 13:49, Recliner wrote:
On Mon, 27 Jan 2020 13:34:55 +0000,
wrote:


https://www.railadvent.co.uk/2020/01...-freight-train
-derails-repair-work-starts.html

Yes, that's the latest problem to hit the unfortunate GOBLin.


"Eight bridges were also damaged"

Holy crap!


Whatever if any warning systems there are on the train to warn the driver
of a possible derailment clearly didn't work if it took him 2 miles to
notice since if the freight on the Goblin runs at the same speed as the NLL
then it was probably trundling along at under 30mph so could have stopped
fairly quickly.


What warning systems might those be?

Unless the driver can feel a difference in the resistance/behaviour of the
train, or the affected wagon is near enough to the front of the train that
the driver can hear it, then you rely on one of two things for the problem
to be discovered:

If the train divides, the brakes will apply; similarly if the damage to a
wagon is enough to split part of the brake pipe (or main res pipe if
fitted/in use). Some wagons have hot axle box detection systems which vent
the brake pipe (usually those with inside bearings ie which won't be
detected by lineside hot box detectors).

As the train damages track it'll leave faults behind it, and the signaller,
upon seeing these, should stop the train.
https://www.gov.uk/raib-reports/report-17-2018-extensive-track-damage-between-ferryside-and-llangennech
refers, in part.

The other possibility is the problem being reported by station/lineside
staff or a passing train.


Anna Noyd-Dryver