[SystemSafety] Passengers travelling through London Paddington are facing continued disruption after a train derailment.

[Dick Selwood]

But why did the derailed vehicle hit the overhead support?  this seems 
to be a bad idea.


On 17/06/2016 15:26, DREW Rae wrote:
>
> Martyn,
> The train was coming from a siding. Derails are used to protect main 
> lines (where the passenger trains run) from unauthorized entry. 
> Unauthorized movements don't necessarily have locomotives, let alone 
> ATP enabled - for example they may be runaway cars.
>
> They're fairly basic mechanical devices - almost like spring loaded 
> levers to force the wheels off the track. The assumption is that 
> whatever you are derailing isn't nearly as valuable as a mainline train.
>
> Drew
>
> On 18 Jun 2016 12:07 AM, "Martyn Thomas" 
> <martyn at thomas-associates.co.uk 
> <mailto:martyn at thomas-associates.co.uk>> wrote:
>
>     Passengers travelling through London Paddington are facing
>     continued disruption after a train derailment.
>
>     Network Rail said the empty train had passed a red signal outside
>     the station, activating an automatic derailment on Thursday.
>     Overhead power lines also came down.
>
>     http://www.bbc.co.uk/news/uk-england-london-36555082 (includes a
>     picture that explains why the overhead power was brought down).
>
>     How does the "automatic derailment" work? Is it really the best
>     solution for a train passing a signal at danger? Surely this can't
>     be used if the train is carrying passengers! Why isn't Automatic
>     Train Protection adequate?
>
>     Martyn
>
>
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