To Fleming's credit, he insisted upon a high quality of workmanship in designing the route, using fills several metres higher than the surrounding landscape, where possible, to prevent snow accumulation, and mandated the installation of iron bridges over streams and rivers rather than the cheaper wooden structures that many railways of the time favoured. This latter decision proved extremely far-sighted as the strength of the bridges and their material saved the line from lengthy closures on numerous occasions in the early years during forest fire seasons. The scale of construction on the Intercolonial made it the biggest Canadian public works project of the 19th century.