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Hi - I am a relative newcomer to garden railways, and live in a climate with strong summer sun and mild winters (Auckland, New Zealand). I recall working out that, given that the rail can get very hot in sunlight, it would be reasonable to estimate a temperature differential of 50 deg Celsius or 90F, and this worked out at about 1mm for every metre of rail, or 0.1% expansion. I laid my first track in summer and during the winter, it tended to get straighter due I assume to contraction, and there is no doubt that the gaps I left became wider. As we move again into summer I will be interested to see if the opposite tends to occur, and the track starts to kink. Regards Bruce
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