Darlington is a market town in the Borough of Darlington, County Durham, England. The River Skerne flows through the town; it is a tributary of the River Tees. The Tees itself flows south of the town. In the 19th century, Darlington underwent substantial industrial development, spurred by the establishment there of the world's first permanent steam-locomotive-powered passenger railway: the Stockton and Darlington Railway. Much of the vision (and financing) behind the railway's creation was provided by local Quaker families in the Georgian and Victorian eras.