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Post by russe on Dec 22, 2005 4:29:26 GMT
Are these common, and do they occur only where space restrictions preclude the installation of traps? Here's one at the sidings of Edgware Road (with I believe a non-standard 'mini'-length trainstop adjacent to it): pic: James MoorhouseRuss
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Post by q8 on Dec 22, 2005 4:47:35 GMT
Are these common, and do they occur only where space restrictions preclude the installation of traps? Here's one at the sidings of Edgware Road (with I believe a non-standard 'mini'-length trainstop adjacent to it): pic: James MoorhouseRuss They are not that common. I have only ever seen them at Edgware Road but they probably exist elsewhere. They are called 'de-railers' and boy are they effective. I once saw a train go over one there and the 'clunks' and bangs as the train hit the deck were impressive. A driver who hits one even at low speed will wind up full length on the floor That is not a 'mini length' trainstop beside it. It is the air engine to operate the device. BTW interestingly you can see the old style 'open' current rail ramps to good effect there.
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Post by tom2506 on Dec 22, 2005 8:50:36 GMT
Why would they want to de-rail a train? To stop it going any further?
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Post by ttran on Dec 22, 2005 9:21:00 GMT
For the same reason as catchpoints...
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Post by russe on Dec 22, 2005 14:18:01 GMT
That is not a 'mini length' trainstop beside it. It is the air engine to operate the device. I must pay a visit to Edgware Road. It's not clear from the original photo what the overall situation is there. Normally, sidings are fitted with the full complement of ground discs, trainstops and trap points, even in comparatively space-restricted situations such as sidings 23, 24 and 25 at Farringdon, but Edgware Road looks like it might not have space for all of these, and from what I know at the moment, I think those scotch blocks (your 'derailers' term seems somewhat of a misnomer, although I agree anything going over one would make a hell of a jolt) are taking the place of conventional traps and trainstops. I would welcome clarification though. There's still quite a lot of them around in sidings where the older light-section conductor rail predominates. The headshunt area at Hammersmith (Met) has got a fine array of venerable specimens for example. If you're looking for something very non-standard in the ramp department, Q8, try this 'snubbie' one (again, at Edgware Road): pic: James MoorhouseClunk! Russ
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Deleted
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Post by Deleted on Dec 22, 2005 15:33:33 GMT
those are definetly not scotch blocks and are called de-rails as the train wheel in the normal operation does not sit in that sort of claw like gizmo, the only place i knew had them were edgware road but looks like you have found somewhere else
if you are looking for strange non standard equipment there is examples everywhere as being typical of lul
one example is barking sidings with a trainstop with a extended arm another is tower hill with all trainstops having paxoline lids as the site has no earth on the signalling system instead using a fault screen (simiular to a earth)
in the pic with the conductor rail ramp looks like its a siding due to the moss and mold at triangle sidings they use tube conductor rails and in depots usually
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Post by russe on Dec 22, 2005 16:26:41 GMT
those are definetly not scotch blocks and are called de-rails as the train wheel in the normal operation does not sit in that sort of claw like gizmo Thanks AET; good rationale. I accept that my use of the term 'scotch block' was inaccurate and misleading. So 'derailers' it is then. In fact, shame on me, I should have checked the signalling diagram, for there they are, in this extract: Going off on another tangent, I note from the full Edgware Road historical diagram* that no traps are present there at all, even for platform 1, presumably a legacy of the Victorian era? And that begs the question as to when traps were generally introduced elsewhere on the system. Russ * I don't think it is one of Harsig's, but it was notified here by someone I believe.
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Post by Harsig on Dec 22, 2005 16:51:30 GMT
* I don't think it is one of Harsig, but it was notified here by someone I believe. It was me actually. The full version can be seen here and here
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Tom
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Post by Tom on Dec 22, 2005 18:41:20 GMT
They are not that common. I have only ever seen them at Edgware Road but they probably exist elsewhere. Edgware Road is the only place with them. I suspect Russ is referring to the box with ramps either side. That's the detector box for the de-railer.
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Post by q8 on Dec 22, 2005 18:49:35 GMT
Prior to it's re-signalling Edgware Road was the only location on the underground where it was possible to carry out every known move in a controlled area.
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Tom
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Post by Tom on Dec 22, 2005 19:05:08 GMT
Resignalling?? What re-signalling? The only differences between the site now and when it was commissioned is that the site now complies with the more rigourous standards which have been introduced. The basic signalling is still as it was in the 20s (and trust me, the wiring looms illustrate that well).
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Post by russe on Dec 23, 2005 0:51:11 GMT
My apols Harsig. Initially I thought it must have been one of yours, but I couldn't locate it in your usual directory, and I didn't want to make an assumption without checking. I suspect Russ is referring to the box with ramps either side. That's the detector box for the de-railer. Yes I was Tom. Derailer detector box. That's it. Russ
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Post by edb on Dec 23, 2005 7:40:50 GMT
pic: James Moorhouse Looks to me like theat could rip a shoe off. That hump in the surface doesn' look too good
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Post by trainopd78 on Dec 24, 2005 18:03:05 GMT
Lets just say things at Edgware Road have been heavily modified. 25 road at Edgware Road sidings is also track fused as an extra deterrent.
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Post by jamesm on Jan 22, 2006 19:46:04 GMT
"I have only ever seen them at Edgware Road but they probably exist elsewhere. "
There were two derailers at the exit points from the sidings south of Rickmansworth.
James Moorhouse
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