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Two further locomotives followed Puffing Billy, although being of similar design each succeeding locomotive was an improvement on the last. They were named Wylam Dilly and Lady Mary. These went through the same conversion to eight wheels and then back to four again and like Puffing Billy were extensively modified.
Wylam Dilly is one of the two oldest surviving railway locomotives in the world; it was built in 1813 by William Hedley and Timothy Hackworth. Wylam Dilly was initially designed for and used on the Wylam Waggonway (or Wagonway) at Wylam Colliery to transport coal.
In 1822 the locomotive was mounted on a keel and served as the engine for a steam paddle wheeler that ferried strikebreakers on the River Tyne
Wylam Dilly is preserved at the National Museum of Scotland in Edinburgh.
A similar steam locomotive, Puffing Billy is in the London Science Museum in London.