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plural siderods
(rail transport) A coupling rod on each side of a locomotive. quotations examples
I recall in particular the amazing speed of the siderods of our elegant little Caledonian 4-6-0 and the vivid contrast between its polished blue livery and the red-funnelled mail steamers and white-hulled yachts crowding Oban Bay; […] .
1951 October, R. S. McNaught, “Lines of Approach”, in Railway Magazine, page 705