 Joined: 26/07/2021(UTC) Posts: 635 Location: Sydney
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The uphill battle! To remove any issues with rail I silver soldered the joints to have continuous "welded" rail. This is handy for uphill spirals in mountains where access is a bit more difficult. I used a medium temperature silver solder. You need a fine point torch to direct heat and silver solder flux. Once the joint is cleaned up with a needle file you wouldn't know the joint was there. The most painful bit is feeding the sleepers back onto the rail, but it's not that bad. I made up a tool to hold the rail in the exact position. This is the key to making the job easy. Both ends are actually butted up together (a bit apart just for the photo). If you have done a bit of silver soldering this is a piece of cake.    
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 9 users liked this useful post by Toosmall
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 Joined: 10/02/2006(UTC) Posts: 3,997
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 Joined: 23/07/2014(UTC) Posts: 8,470 Location: ENGLAND, Didcot
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I'll be interested to see what problems you have with temperature variations in the room.
I have observed problems with layouts on the exhibition circuit here in the UK where the layout will operate for hours - until taken to an exhibition and with all the people in the exhibition hall the temperature rises 5-10C above the usual and the rails go out of gauge or move resulting in derailment problems.
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2 users liked this useful post by kiwiAlan
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Joined: 26/07/2021(UTC) Posts: 635 Location: Sydney
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The thermal expansion coefficient at 13.5um of the nickel rail is less than the thermal coefficient of the base material so the rail actually shrinks in relation to the base as the temperature increases.
I had this sort of issue between aluminium and steel in the 1980s on a job than changed 50°C and caused a few issues until I factored the two different coefficients in.
On another job the various alloy elements changed enough between the standard minimum and maximum element tolerance to cause an issue. That was a challenge until I realised the small percentage of alloy elements were causing the problem and not the metal as a whole.
Also if you are using timber that changes size a fair bit depending on the level on humidity. We notice this with our timber floors. Currently cold weather and our typical dry winter weather causes gaps to appear between the floorboards.
With the rail I have never had an issue.
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2 users liked this useful post by Toosmall
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 Joined: 20/02/2017(UTC) Posts: 298 Location: Flanders!
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just add more feeding connections?!?
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Joined: 20/02/2017(UTC) Posts: 298 Location: Flanders!
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or is it to reduce bumps?
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Joined: 26/07/2021(UTC) Posts: 635 Location: Sydney
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It is the speed bumps. Some carriages are ok, some aren't, remove the problem.
I have regular electrical connections as nickel has 4 times the resistance of copper.
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1 user liked this useful post by Toosmall
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