Templot Club Archive 2007-2020
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posted: 20 Sep 2013 10:38 from: roythebus
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On the Rother Valley Railway at Robertsbridge they've just completed a new curved turnout which is VERY long; according to the track plan in the station building, it's 146m outside radius and 142m inside radius. The rails are marked as H for the switch rails and a 1 in 20 crossing! When I manage to download the photos from my phone [url=mailto:I'@ll]I'll[/url] post them on here. Quite why they made it so long is beyond me, but I gather the track was designed by London Underground staff. Some of the concrete sleepers in the area are s/h from LUL, so still have the mountings for 3rd and 4th rail! The RVR is still officially a building site at the moment, so please don't go wandering down there to look. There is a grand opening this weekend (21st and 22nd September 2013) with trains running the length of the line to Eastbridge Street, about 500m. I got my pictures from being officially on site, learning the layout as a shunter! |
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posted: 8 Oct 2013 00:31 from: roythebus
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roythebus wrote: On the Rother Valley Railway at Robertsbridge they've just completed a new curved turnout which is VERY long; according to the track plan in the station building, it's 146m outside radius and 142m inside radius. The rails are marked as H for the switch rails and a 1 in 20 crossing! 1752_071924_210000000.jpg  1752_071925_060000000.jpg  1752_071926_020000000.jpg  1752_071926_350000000.jpg  1752_071926_350000000.jpg 1752_071928_100000000.jpg  The radius of the inner curve is 142m, the outer curve 146m or something similar! This uses an H switch and 1 in 20 crossing, making a very long turnout indeed. There's a track diagram in Robertsbridge (RVR) station building with all the radii on it! |
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posted: 8 Oct 2013 01:19 from: Martin Wynne
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Hi Roy, Many thanks for the pics. It's quite unusual to see such a long turnout being installed in bullhead track nowadays. Do you know if it is a new 1:20 crossing, or second-hand recovered from elsewhere? The reason it is so long is because the two radii are so similar -- 142mm / 146mm. That's a difference of only 2.8% so I'm quite surprised it isn't much longer than a 1:20. A quick check suggests such close radii would require about 1:40. Of course no such bullhead crossing is available. An H switch would normally be natural at about 1:28. Perhaps 1:20 was the flattest bullhead crossing available? Thanks again for the pics. regards, Martin. |
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posted: 8 Oct 2013 08:05 from: roythebus
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It appears to be a completely new turnout. The trackwork for Robertsbridge was designed by London Underground staff. Quite why they chose such a long turnout is a mystery! Maybe they had parts left over from another project? |
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| Last edited on 8 Oct 2013 08:07 by roythebus |
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