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Wylam Dilly is the second oldest surviving rail transport locomotive in the world; it was built circa 1815 by William Hedley and Timothy Hackworth for Christopher Blackett, the owner of Wylam colliery, west of Newcastle upon Tyne. Wylam Dilly was initially designed for and used on the Wylam Waggonway to transport coal. The four driving wheels are connected by a train of spur wheels driven by a central crankshaft.H.C. Casserley (1976). 071100725X, Ian Allan. 071100725X
Because it proved too heavy for the cast iron plateway in its original form, the locomotive was rebuilt with eight wheels in 1815, but returned to its original design in 1830 after the track was relaid with wrought iron rails. The locomotive was still at work in 1862 when it was moved to Craghead Colliery.Casserley After withdrawal it was presented to the Edinburgh Museum of Science and Art in 1883, now called the National Museum of Scotland, where it is currently on display. The first steam locomotive of its class, Puffing Billy, is in the Science Museum in London.
In 1822, the locomotive was temporarily mounted on a keelboat and served as the engine for a steam Paddle steamer that ferried strikebreakers on the River Tyne.
Until a thorough examination of Wylam Dilly and Puffing Billy was undertaken in 2008, it was thought that Wylam Dilly was the oldest surviving steam locomotive in the world. The research results, released in late 2008, showed that Wylam Dilly was built after Puffing Billy, incorporating improvements on the locomotive's design that were not present in Puffing Billy.
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