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posted: 28 Nov 2016 23:36 from: Geoff Cook
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146_281834_160000000.jpg There is a discussion about this turnout on thread on RMweb: http://www.rmweb.co.uk/community/index.php?/topic/69736-pencarrow-pg155-new-templot-plans/page-162#entry2512902 What operates the wing rail? Geoff Cook |
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posted: 29 Nov 2016 00:22 from: Martin Wynne
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Hi Geoff, It's a spring crossing. The wing rail is forced open by the wheel flanges -- because of this it is very important that the check rail is correctly positioned and well maintained. Here are the words and music from BRT3: 2_281920_520000000.jpg 2_281921_080000000.jpg regards, Martin. |
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posted: 29 Nov 2016 00:35 from: Geoff Cook
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Thanks very much Geoff |
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posted: 9 Dec 2016 06:15 from: rodney_hills
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Hello, The obvious next question arising is: Has anyone built a model of same, that operates prototypically ? Regards, Rodney Hills |
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posted: 9 Dec 2016 12:58 from: Roger Henry
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OK. I can see from the drawing how a spring 'frog' device can work, but the drawing does not really resemble the photograph. Well, it seems that the 'frog' in the photograph can only be operated by wheel-flanges that are being diverted from the main (straight) track. How does a wheel-set that is leaving the siding, operate the spring-crossing ('frog')? There appears to be nothing for the wheel-flange to push against. Grateful advice, as we used to say. |
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posted: 9 Dec 2016 13:07 from: JFS
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In what way does the drawing differ from the photo? Perhaps you have not grasped that it is not crossing nose which moves but the wing rail? Hence a wheel, which ever direction it is travelling, would simply push the wing rail aside. The crossing stays put and (as the text says) te flange is guided by the check rail. (The small green reptile you mentioned need not be involved.) These things were so common that I am surprised they have raised such interest. They are still quite widely to be seen about the London Underground Network (which I appreciate is a long way from Brisbane!). |
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Last edited on 9 Dec 2016 13:09 by JFS |
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posted: 9 Dec 2016 13:29 from: Roger Henry
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Ahh. Looking again at the picture and the drawing, I see where my confusion has come about. I appreciate that it is the wing-rail that moves and not the green-reptile (sorry about that). What I was not interpreting from the photograph was that one wing rail has a more pronounced 'flare' at one end that the other wing-rail, which is hard to see in the photograph. Your comments have made it clearer what is happening and I can now discern the details better on the photo. Sadly, Queensland is bereft of exotic track-crossings, except for some dual-gauge work on a small section of the suburban network. There was one, lonely double (scissors) crossover in Rockhampton, but it has long since vanished due to track alterations. I don't think it would be all that easy to model as a reliable device. Maybe 7mm models would have the mass to make it work as intended, The smaller scales would, I suspect, derail. One could, of course, make it a switched crossing. |
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posted: 9 Dec 2016 13:45 from: JFS
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That is not a good score for interesting track - but in truth, it is not that much better here... I agree about making it work in model form but on the real thing, they are / were only used where the "Branch" road was very infrequently used compared to the Main, and on LUL the most common situation is for over-run sidings which are "never" intended to be used. So you could model one as a fixture for that circumstance. | ||
Last edited on 9 Dec 2016 13:46 by JFS |
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posted: 9 Dec 2016 14:00 from: JFS
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This video shows one at about 0.50 (possibly two of them - not sure about the one on the left). Lots of interesting signalling shots later on. | ||
posted: 9 Dec 2016 14:12 from: Roger Henry
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Video link please? Or have I got myself lost again?:_) | ||
posted: 9 Dec 2016 16:37 from: JFS
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Oops, it's my age you know... http://www.youtube.com/watch?v=YH2ZC9rbxSw |
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posted: 10 Dec 2016 11:49 from: Roger Henry
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Thank you for that Sir. Interesting and evocative. Desperate days. Contrails and all. The Black and White gives the film some nice atmosphere (The Germans had all the colour print). A London bus does look a tad odd when seen in B and W. | ||
posted: 10 Dec 2016 16:51 from: Jim Guthrie
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I remember the Underground system not being much changed when I started work in London about twenty years later. Jim. |
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