Templot Club Archive 2007-2020
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posted: 27 Jan 2010 23:40 from: Nick R
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I am trying to get the basic crossing half diamonds in place so that I can start creating a double slip. The crossing was done by 'Tools/make ladder crossover' on a turnout in one side of a curved section of double track. All would be well, except that I don't want the crossing line to curve back towards the double track but, rather to diverge from it. I've previously made a single slip in straight track, but am completely flummoxed by trying to do this to fit into an existing plan and space. The attached box file contains the main bits extracted from a larger plan. The crossing (half diamonds 3 and 6) should diverge from the curved lines to meet up with line 1 in the upper right. The main running lines can't be moved (too much) as they already exist. Template 1 could be moved a bit, but i'd prefer to keep most of it very near its current position. Any help or suggestions would be very welcome. Nick |
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| Attachment: attach_733_1026_crossing-question.box 195 | |||
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posted: 28 Jan 2010 00:39 from: Martin Wynne
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Hi Nick, See: topic 958 - message 5552 regards, Martin. |
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posted: 28 Jan 2010 01:01 from: Nick R
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Hi Martin, Thanks for the quick reply  I've downloaded the irreg_double_junct.box file and will take a look. Assuming I can work out how to do it with partial templates, are there any gotchas in store when I attempt to change it into a double slip?Nick |
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posted: 28 Jan 2010 01:14 from: Martin Wynne
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Nick R wrote: I've downloaded the irreg_double_junct.box file and will take a look. Assuming I can work out how to do it with partial templates, are there any gotchas in store when I attempt to change it into a double slip?Hi Nick, A quick look suggests that the K-crossings will be about 1:3.5. So an ordinary inside slip is out of the question for any sensible radius. So it will have to be a double outside slip. A picture of one such is at: http://85a.co.uk/forum/view_gallery_single.php?display=ALL&page=1 regards, Martin. |
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posted: 28 Jan 2010 08:39 from: Nick R
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Martin Wynne wrote: A quick look suggests that the K-crossings will be about 1:3.5. So an ordinary inside slip is out of the question for any sensible radius.Yes, I'd wondered about that and was concerned that I'd not seen an example of one outside of a yard. Here, we are crossing the main running line, admittedly on a minor branch with minimal passenger traffic. One early photo appears to show something that might be a Barry slip but is unclear because of a strategically placed telegraph pole  Such are the problems of trying to compress the prototype into too small a space (hence the 9ft heels). Mind you, the problem is of my own making because I need to reverse the curve in the running line and the original would have had both lines curving the same way... Nick |
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posted: 28 Jan 2010 09:11 from: Martin Wynne
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Nick R wrote:I'd wondered about that and was concerned that I'd not seen an example of one outside of a yard. Here, we are crossing the main running line, admittedly on a minor branch with minimal passenger traffic.Hi Nick, There is a picture of a double outside slip in a running line on page 43 of "A Pictorial Record of Great Western Signalling"* . It is also non-symmetrical, which adds to the fun.  * A. Vaughan, OPC, 1973, ISBN: 0902888080 : http://www.abebooks.co.uk/products/isbn/0902888080 regards, Martin. |
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posted: 28 Jan 2010 10:10 from: Nick R
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Thanks, Martin. Always good to have a precedent. That sounds like something to add to the bookshelf. Nick |
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