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Post by londonstuff on Jul 4, 2010 20:43:55 GMT
I took this photo today from by Sainsbury's on Cromwell Road. Something I've often wondered when passing on the train is the stopping board barrier thing - not sure of its correct name - towards the right of the photograph and why it's there. Certainly I can't see any evidence of a siding/shunt neck, etc. in Quail 5 or the London Railway Atlas. What is/was it here for?  |
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Post by Dstock7080 on Jul 4, 2010 20:53:05 GMT
Prior to the mid-60s remodelling the road you describe would've been the EB District into Gloucester Road pfm2.
The later (current) EB is passing at the left.
Now, the short spur protects both WB/EB roads if a train over-runs Gloucester Road pfm2 WB, and directs it toward the buffer stop.
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Post by setttt on Jul 4, 2010 20:56:41 GMT
It's a short spur and sand drag on which a train from the middle platform will end up if it passes the signal controlling the route round to HSK at danger and the associated points have not been set, thus avoiding a potential collision with an eastbound train from Earl's Court.
DStock7080 beat me to it!
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roythebus
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Post by roythebus on Jul 6, 2010 5:28:26 GMT
The same sort of arrangement would have prevented the Ladbrook Grove tragedy; the Northwich collision in the WCML and probably more...
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Deleted
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Post by Deleted on Jul 6, 2010 6:47:39 GMT
The same sort of arrangement would have prevented the Ladbrook Grove tragedy; surely with no other protection to stop the train it would have then derailed or struck the buffer stops then possibly fouled multiple lines. Unlike on LU where there are train stops. And where would this have gone? Maybe taking note of the poor sighting of signal SN109 and taking action to improve the sighting may have helped. |
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Phil
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RIP 23-Oct-2018
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Post by Phil on Jul 6, 2010 10:18:51 GMT
The same sort of arrangement would have prevented the Ladbroke Grove tragedy It would - but the whole design of that area was so severly flawed that if NR's own design principles had been implemented correctly there would have been no tragedy either. Poor signal sighting should not have made a difference if protection rules had been applied properly at the design stage. But, back on topic, if the trainstops are correctly placed there should be no need for sand drags (although in the case of Hanger Lane junction I could be persuaded that an exception may be valid). |
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Colin
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Post by Colin on Jul 6, 2010 10:53:16 GMT
Relying on train stops alone isn't a good idea - what if the trip arm on the train becomes defective? What if a driver re-set and carried on? It can happen!!
As for Hangar Lane, there is no sand drag or trap points there so I'm interested to know why you think it'd be necessary there....
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Post by londonstuff on Jul 6, 2010 17:31:49 GMT
It's a short spur and sand drag on which a train from the middle platform will end up if it passes the signal controlling the route round to HSK at danger and the associated points have not been set, thus avoiding a potential collision with an eastbound train from Earl's Court. DStock7080 beat me to it!Given that the overlap system in LU signalling is used, should any signal not be far enough back to stop any potential overrun as it's designed for maximum line speed + 10%? |
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Colin
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Post by Colin on Jul 7, 2010 1:03:45 GMT
Ah but it's not always possible to cater for everything purely through overlaps, and as I've already said, you can't always rely on train stops alone.
This particular location is far too tight for comfort should there be a mishap with an outer rail Circle overrunning, so the mitigation is the spur with a buffer at the end. I would say sand drag but there's not even enough to make a sand castle there.
The normal position of the points there is for the buffers - they don't move unless the route is clear at the appropriate time (ie, when the route to High Street is required).
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Post by singaporesam on Jul 7, 2010 14:58:48 GMT
if the trainstops are correctly placed there should be no need for sand drags (although in the case of Hanger Lane junction I could be persuaded that an exception may be valid). Ealing Common Depot East end can also be hit with ease , its not too difficult to beat the speed control and still fail to stop in time when you're shunting |
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