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See description here NZ1164 : Former smithy, Wylam

"The last remaining part of the buildings where William Hedley built Puffing Billy and Wylam Dilly. Timothy Hackworth, John Foster and William Hedley built the first Wylam engine in 1811, the first properly useful steam locomotive, followed by the preserved Puffing Billy and Wylam Dilly in 1814-15."
Wylam Forge is Grade II Listed (List entry Number 1155062) Link