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Marc Seguin (April 20, 1786 - February 24, 1875) was a French engineer. He developed the first suspension bridge in continental Europe. He built and administered 186 toll bridges throughout France. In 1825, he acquired two of George Stephenson's engines, but they 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 mechanically driven fans to provide draught on the fire, rather than Stephenson's blastpipe. His 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. 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. He also wrote books on the use of physics and mathematics in building bridges and locomotives engines. His name is one of the 72 n...