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topic: 3061Irregular switch-diamond
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posted: 13 Aug 2017 11:05

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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A short irregular diamond fitted with movable K-crossings (switch-diamond) because of the sharp curve, even though the angle is quite short. Also mechanically worked and with facing-point locks both ways -- making a nice collection of rods and cranks: 

http://www.flickr.com/photos/pics-by-john/14706658048/in/photostream/

Thanks to John Woolley.

Martin.

posted: 13 Aug 2017 11:16

from:

Jim Guthrie
 
United Kingdom

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What are the flat strips just outside the rails in the six foot on each side of the diamond?

Jim.
Last edited on 13 Aug 2017 11:17 by Jim Guthrie
posted: 13 Aug 2017 11:52

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Jim Guthrie wrote:
What are the flat strips just outside the rails in the six foot on each side of the diamond?
Hi Jim,

They are stiffeners attached to the ends of the timbers, to prevent the timbers moving apart or closing up.

It is important that the K-crossing wing rail knuckles don't move out of alignment with the moving point rails.

In a fixed K-crossing they are all bolted solid with spacer blocks, but obviously that's not possible with moving point rails.

In an ordinary switch, switch anchors do the job of keeping the moving point rails aligned with the stock rails. Because of the much steeper switch angles in a switch-diamond, such anchors would not be feasible.

regards,

Martin. 

posted: 13 Aug 2017 13:11

from:

Jim Guthrie
 
United Kingdom

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Martin,

Thanks for that.

Jim

posted: 13 Aug 2017 13:39

from:

John Palmer
 
 

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Interesting photograph. What's the purpose of enclosures adjacent and at right angles to the K crossing? Electrical detection?

posted: 7 Sep 2017 20:48

from:

DM
 
United Kingdom

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Martin Wynne wrote:


In an ordinary switch, switch anchors do the job of keeping the moving point rails aligned with the stock rails. Because of the much steeper switch angles in a switch-diamond, such anchors would not be feasible.




regards,




Martin. 




There are strengthened switch diamonds that have a short sections of extra rail between the switch and stock rails which act much like switch anchors/heel blocks. The extra rails are attached to the switch rails at their fixed end and to the stock rails near to the toes of the switches, so transferring stress from one to the other and limiting the length of switch that can expand and contract as the temperature changes.




Thermal movement being one of the more common causes of trouble with switch diamonds, and is why they are the most likely track item to get painted white.



Image borrowed from cab video as I never seem to have gotten round to taking a photo myself.







Attachment: attach_2485_3061_SSD.jpg     214
Last edited on 7 Sep 2017 20:53 by DM


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