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                 Swiss switch rails
     
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1st message | this message only posted: 29 Feb 2020 07:49
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from:
Alan McMillan
Edinburgh, United Kingdom



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Does anyone know of a source of the type of rail section that can be used to create switch rails like this?:






As you can see the rail has a very wide foot which ends just beyond the last slide chair where the standard rail section takes over. You can also see that it is only about two-thirds of the height of the standard section so it can clear the foot of the adjacent stock rail.
If I can't sorce the correct rail does anyone have any ideas about how it might be fabricated, possibly from a smaller section standard rail than the Code 82 stock rail I intend to use?

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2nd message | this message only posted: 29 Feb 2020 15:12
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from:
Phil O
Plymouth, United Kingdom



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Hi Alan,

can I suggest that you solder a strip of nickel silver to the foot of your rail. The thickness of the strip would need to closely match the thickness of the rail foot and the width is whatever you need to match the additional width of the foot. It may not be 100%, but I think it might pass muster at usual viewing distances.

Cheers

Phil.
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3rd message | this message only posted: 29 Feb 2020 16:46
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from:
Trevor Walling
United Kingdom

 

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Hello,
You may have flexibility issues with a rail foot that wide in a modelling scenario.
Regards
Trevor:)
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4th message | this message only posted: 29 Feb 2020 16:52
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from:
Jim Guthrie
United Kingdom

 

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Trevor Walling wrote: Hello,
You may have flexibility issues with a rail foot that wide in a modelling scenario.
I was thinking that the prototype would have the same problem but I can't see any form of hinge (whatever) at the heel - just a fishplate.

Jim.

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5th message | this message only posted: 29 Feb 2020 17:43
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from:
Bernard Haste
 

 

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I did what Phil suggested in modelling this type of Swiss pointwork. I silver soldered it together having filed the web and foot away until I had the correct amount of material left allowing for the thickness of the nickel silver I was adding to it. The heating was done very carefully!

The rails in this type of point have a section of the foot removed either side beyond the special section. You can see this in the pictures. This means that most of the flexing takes place in that area well away from the blades themselves.

Bernard
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6th message | this message only posted: 29 Feb 2020 23:46
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from:
Andrew Barrowman
USA

 

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I'm trying to understand what the two-bolt "fishplates" do. Could they be to prevent the point blades flexing and potentially failing due to fatigue at those locations?
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7th message | this message only posted: 1 Mar 2020 12:52
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from:
Alan McMillan
Edinburgh, United Kingdom



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Phil O wrote: Hi Alan,

can I suggest that you solder a strip of nickel silver to the foot of your rail. The thickness of the strip would need to closely match the thickness of the rail foot and the width is whatever you need to match the additional width of the foot. It may not be 100%, but I think it might pass muster at usual viewing distances.

Cheers

Phil.Thanks Phil. I think maybe a small L section would be stronger. Flexing of the blades won't be an issue as I intend to model the older type of Swiss turnouts that were of the loose heel design.

Alan

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8th message | this message only posted: 2 Mar 2020 08:08
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from:
Bernard Haste
 

 

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I was told many years ago that the fishplate was there as insurance against the blade and closure rail falling apart in case the weld between them failed. Whether this is true I do not know.

Bernard
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9th message | this message only posted: 2 Mar 2020 16:45
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from:
Andrew Barrowman
USA

 

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Thank you Bernard. I would think there will be a weld at that location and it would make a lot of sense to add those stiffeners to prevent the weld failing.

Cheers,
Andy
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