The last element to be completed in the main line of the Boston & Providence Railroad, the Canton Viaduct rises 70 feet and extends for 615 feet as one of the most impressive masonry structures of its time in the United States. Thick buttresses that culminate in segmental arches supporting the cantilevered track bed connect two parallel walls five feet thick, separated by a four-foot air space. At the base, six arches perforate the wall for
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Canton Viaduct
1834–1835, William Gibbs McNeill and George Washington Whistler, engineers. Neponset and Walpole sts.
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