Hackworth was the first engineer to establish the steam engine as a completely reliable machine. He was appointed to take charge of the locomotives on the Stockton to Darlington Railway and he also built a locomotive works at Shildon as part of the line. In 1829, Hackworth entered the engine 'Sans Pareil' (pictured right) for the Rainhill Trails. The engine was withdrawn due to a cracked cylinder. Hackworth resigned from the Stockton and Darlington Railway and continued with his locomotive business in Shildon.