Engineer William Hedley, inventor of the oldest surviving steam locomotive 'Puffing Billy', died #OTD in 1843. Here is the 1813 engine in 1881, pictured with two of Hedley's sons from our Stephenson collection. (Today it can be found @sciencemuseum ) #throwbackthursday pic.twitter.com/3GU7ENrIGS

— IMechE Library & Archive (@IMechELibrary) January 9, 2020