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Why does the overhead wires hang with a slight hang in summertime but tightly in wintertime

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Wires lengthen with higher temperatures. In the summer the longer wires sag, while in the winter the shorter wires are more taut.

This is the reason railroad tracks are laid out with gaps between them to allow them to expand in the heat.

Posted on Oct 31, 2012

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Why do overhead wires hang with a slight sag in the summertime but tightly in the wintertime?


Wires lengthen with higher temperatures. In the summer the longer wires sag, while in the winter the shorter wires are more taut.

This is the reason railroad tracks are laid out with gaps between them to allow them to expand in the heat.

Oct 31, 2012 | Cars & Trucks

1 Answer

Why does the overhead wires hang with a slight hang in summertime but tightly in wintertime?


Wires lengthen with higher temperatures. In the summer the longer wires sag, while in the winter the shorter wires are more taut.

This is the reason railroad tracks are laid out with gaps between them to allow them to expand in the heat.

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