Etymology
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siding (n.)

c. 1600, "a taking of sides in a conflict or debate," verbal noun from side. First attested 1825 in the railroad sense; 1829, American English, in the architectural sense of "boarding on the sides of a building."

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Definitions of siding

siding (n.)
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass;
Synonyms: railroad siding / turnout / sidetrack
siding (n.)
material applied to the outside of a building to make it weatherproof;
From wordnet.princeton.edu