Templot Club Archive 2007-2020
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posted: 25 Feb 2013 13:14 from: Raymond
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I am working on a ladder crossing over two tracks. If I use a curviform crossing, the resulting diamond from the turnout (14' @ 1;10) is just over 1:5, far too tight for running lines. A regular crossing results in a 1:10 diamond but I want a single slip there too. Would it be prototypical in 1900 GWR practice to have an outside slip on a moving elbow diamond? I can find nothing in David Smith's book to suggest either way. Regards and thanks to anyone who can help. Raymond |
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posted: 25 Feb 2013 14:15 from: JFS
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Yes it would! regards, Howard.  |
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posted: 25 Feb 2013 14:38 from: Martin Wynne
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Raymond wrote: Would it be prototypical in 1900 GWR practice to have an outside slip on a moving elbow diamond?Hi Raymond, It's not If the diamond is flat enough to need to be switched, it is usually long enough for a normal inside slip. You are not restricted to the two options you gave, you can manually add a branch curve of some intermediate radius if necessary, and make a diamond-crossing at the intersection where it crosses the adjacent track. Shorten the turnout (F4) to just beyond the end of he check rails, and then put the peg on the TOLP peg position. You can then manually peg on a curved branch track and adjust the radius to give the required size of diamond-crossing. An alternative approach is to make a simple crossover, convert the new turnout to half-diamond, put the peg on CTRL-4 and manually adjust the K-crossing angle (F10) to the required curve. Then make diamond-crossing. Ask again if you need more details about these methods. regards, Martin. |
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posted: 25 Feb 2013 15:16 from: JFS
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Sorry, my mistake - I misread the word "Outside" Howard |
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posted: 25 Feb 2013 15:52 from: Raymond
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Many thanks Martin, I will try your suggestions and post the results later. Regards Raymond |
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posted: 25 Feb 2013 16:35 from: Raymond
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OK, had a play with it and this seemed logical to me but whether it is correct or not I know not. I'll also bet there is a simpler way to do too. Regards Raymond |
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| Attachment: attach_1565_2166_switched_diamond_slip.box 201 | |||
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posted: 9 Mar 2013 00:46 from: Ian Allen
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Raymond, The only fly in your ointment is the date of the first switched diamond in the UK.I believe it was 1936 on the LNER. Ian |
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posted: 9 Mar 2013 02:33 from: Martin Wynne
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Ian Allen wrote: The only fly in your ointment is the date of the first switched diamond in the UK. I believe it was 1936 on the LNER.Hi Ian, Switch diamonds were used by several pre-group companies including the NER (1912). C. J. Allen (Modern British Permanent Way, 1915) says "Movable obtuse, or diamond, crossings are constructed entirely on the switch principle, and a recent example, as laid by the LBSCR at the new Victoria station, is shown in the diagram in Fig. 119." The diagram shows backing rails similar to those used by the GWR, and a rocking crank device on the stretcher bars, described as "Messrs. Sykes and Howard's Patent Movable Diamond Crossings". regards, Martin. |
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