Background
George Stephenson was appointed as engine-wright at Killingwoth Colliery in 1812 and immediately improved the haulage of the coal from the mine using fixed engines. But he had taken an interest in Blenkinsop's engines in Leeds and Blackett's experiments at Wylam colliery, where he had been born. By 1814 he persuaded the lessees of the colliery to fund a "travelling engine" which first ran on 25 July. By experiment he confirmed Blackett's observation that the friction of the wheels was sufficient on an iron railway without cogs but still used a cogwheel system in transmitting power to the wheels.
Read more about this topic: Killingworth Locomotives
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