page_title: Marc Seguin
section_title: Steam locomotives
hierarchical_section_title: Marc Seguin / Career / Steam locomotives
caption_attribution_description: France Paris Champs Elysées Expo Train capitale 2003 Locomotive Seguin Auteur&#160;: GIRAUD Patrick
context_page_description: Marc Seguin was a French engineer, inventor of the wire-cable suspension bridge and the multi-tubular steam-engine boiler.
context_section_description: Shortly after the Stockton and Darlington Railway in England opened (1825) he visited it and observed George Stephenson's Locomotion in operation and acquired two of his engines, which however proved unreliable in French conditions. In 1829, he delivered two steam locomotives of his own design to the Saint-Étienne–Lyon railway. These used an innovative multi-tube boiler and also prominent mechanically-driven fans to provide draught on the fire, rather than Stephenson's blastpipe. This boiler resembled the later Scotch marine boiler in some aspects, in that the boiler had a large single flue from the furnace, then many small-diameter fire-tubes returning to a chimney above the firebox door. Uniquely, Seguin's design also arranged the furnace in a large square water-jacketed firebox beneath the boiler to provide a large grate area and greater heating capacity. Robert Stephenson had also made the same decision with his Rocket, but placed his firebox separately and behind the main boiler shell. Seguin's boiler enabled steam-engine trains to increase power and velocity from 4 miles per hour to 25 miles per hour, making railroad a more viable mode of transportation.
caption: Replica of 1829 locomotive Marc Seguin at the Champs Elysées Expo Train Capitale, Paris, 2003.
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