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A single message from topic:  Irregular switch-diamond   in forum:  Prototype pics
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Single message by DM       Topic: Irregular switch-diamond
Posted: 7 Sep 2017 19:48
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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.







Attached Image (viewed 159 times):

SSD.jpg

Last edited on 7 Sep 2017 19:53 by DM


A single message from topic:  Irregular switch-diamond   in forum:  Prototype pics
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