[[File:Locomotive Seguin 01.JPG|thumb|right|Replica of 1829 locomotive ''Marc Seguin'' at the Champs Elysées Expo Train Capitale, Paris, 2003.]]
Shortly after the [[Stockton and Darlington Railway]] in England opened (1825) he visited it and observed [[George Stephenson]]'s ''[[Locomotion No 1|Locomotion]]'' in operation and acquired two of his engines, which however proved unreliable in French conditions.<ref>{{cite book|last=McNeil|first=Ian|title=An Encyclopedia of the History of Technology|url=https://books.google.co.uk/books?id=o7yJAgAAQBAJ&pg=PA561&lpg=PA561|accessdate=Jul 19, 2015|page=561}}</ref> In 1829, he delivered two steam locomotives of his own design to the [[Saint-Étienne–Lyon railway]].<ref name="Snell, Early Railways" >{{cite book
}} Also see: {{cite book |title=A History of Railway Locomotives Down To The End Of The Year 1831, Chapter XXIV "Marc Seguin" |url=https://books.google.com/books?id=IhkZAAAAIAAJ&pg=PA236 |last=Dendy Marshall |first=Chapman Frederick |year=1953 |publisher=The [[Locomotive Publishing Company]] |location=London |pages=236–240 |accessdate=2009-06-13}}</ref> 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 ''[[Stephenson's Rocket|Rocket]]'', but placed his firebox separately and ''behind'' the main boiler shell.<ref name="Snell, Early Railways" /> 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.
