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The Viaur Viaduct near Aveyron, France, is an impressive steel cantilever truss railway bridge, 116m above the floor of the Viaur valley.
Total length 460m. Span of arch 220m.
Engineer: Paul-Joseph Bodin. Built by the Société de Construction des Batignolles.
See Wikipedia entry (French).
For photographs, see Structurae website.
Numerous photos taken during construction here.
Aspects of the design and construction were described in The Engineer in 1903