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The Northumbrian
Built in 1830, the Northumbrian was an enlarged version of the Rocket with the cylinders almost horizontal. The other important change was that George Stephenson and Robert Stephenson had the firebox incorporated into the boiler for the first time and had a smokebox in the front, to produce what became the conventional locomotive boiler. With George Stephenson on the footplate, the Northumbrain was used as the leading locomotive during the opening of the Liverpool & Manchester Railway on 13th September, 1830.
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The Northumbrian with its integral firebox







