 However, it again broke the rails and Trevithick was forced to abandon the demonstration after just two months.The first commercially successful steam locomotive was the twin cylinder "Salamanca", built in 1812 by John Blenkinsop and Matthew Murray for the gauge Middleton Railway.Blenkinsop believed that a locomotive light enough to move under its own power would be too light to generate sufficient adhesion, so he designed a rack and pinion system for the line.