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Sapperton Tunnels

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Sapperton Tunnels 01/01/2012 at 16:15 #26576
Steamer
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2992 posts
Hi,
Why do Sapperton tunnels have lights showing whether or not they are clear?

"Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q)
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Re: Sapperton Tunnels 02/01/2012 at 01:48 #26609
MikeW
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" said:
Hi,
Why do Sapperton tunnels have lights showing whether or not they are clear?
I seem to recall reading somewhere that it is to allow the signaller, in the event of a failed train, to be sure whether the failure is inside the tunnel or not, since different recovery procedures are required. That may well be tosh - my memory isn't the most reliable instrument these days! Hopefully others with more detailed knowledge will also respond.

Mike

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Re: Sapperton Tunnels 02/01/2012 at 05:55 #26615
pilotman
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This feature is also in operation at Stansted, which is a single line tunnel, but I can't remember the reason.
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