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[quote user="erikem"]Climate as in the northern High Plains? My dad's home town, Miles City, was -30F the morning of Jan 1, and summer air temps can be over 100F. [/quote] Yes, as one example. The rail can get even warmer than the ambient temperature. Then take the Mojave desert, in this case Death Valley, with low temperatures of 15°F and highs of 130°F. For both examples it makes sense to use a different neutral temperature at which in-situ welds are made. The tendency will be to choose temperatures as high as suitable. Tensile stresses (braking) are better controllable than compressive stresses (buckling). Regards, Volker
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