Templot Club Archive 2007-2020
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posted: 15 Feb 2013 18:19 from: LSWRArt
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It strikes me that there are only a limited range of angles which can work for single or double slips. If the two tracks crossed at 90 degrees you would clearly end up with a right angle crossing joined by two points. Equally, at the other end of the scale, 1 is 8 is the maximum with fixed K-crossings, so it seems to me that there is only a limited range where slips sensibly work without the point blades getting tangled up with the V-crossing, or creating other problems. So the question is - what range of sizes work well for an inside slip and is not too difficult to build? Hopefully, someone in the group has worked it out, to save me trying lots of different crossing angles to find out which angles work best. N.B. I am working in 0-MF. Thanks Arthur |
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posted: 15 Feb 2013 18:33 from: Martin Wynne
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LSWRArt wrote:Equally, at the other end of the scale, 1 is 8 is the maximum with fixed K-crossingsHi Arthur, Slip roads work well with movable K-crossings (switch-diamonds) because there are no K-crossing check rails to get in the way. So in practice there is no upper limit, you can add slip roads to a very long switch-diamond if you wish. Here is an excellent picture from Mick Nicholson showing a flat-bottom double-slip with movable K-crossings: fb_movablek_dslip.jpg  © thanks to Mick Nicholson At the lower end of the scale, 1:7 is usually the bottom limit for inside slips on the prototype. 1:6 is possible, but the radius is tight and normally found only in sidings. Generally below about 1:7, outside slips are used instead. regards, Martin. |
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posted: 15 Feb 2013 18:49 from: LSWRArt
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Thanks Martin for the usual prompt response. I will try to see if 1:7 will fit. Do you have any idea when moveble K-crossings were first introduced on British railways? I model c. 1912 and I have always assumed that these were a relatively modern (post WW2?) invention? Regards Arthur |
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posted: 15 Feb 2013 20:15 from: Martin Wynne
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LSWRArt wrote:Do you have any idea when movable K-crossings were first introduced on British railways? I model c. 1912 and I have always assumed that these were a relatively modern (post WW2?) invention?Hi Arthur, No, they have a long history. The NER had some in 1912.  regards, Martin. |
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posted: 16 Feb 2013 10:56 from: LSWRArt
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Hi Martin Thanks for the info. Best wishes, Arthur |
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