Stockton and Darlington Railway
The new company was the Pontop and South Shields Railway of 1842. The south-western part of the line from Stanhope to Carrhouse was sold to the Derwent Iron Company, which operated at Consett. It formed an alliance with the Stockton and Darlington Railway and in time a railway connection through Bishop Auckland and that section became part of the Stockton and Darlington Railway system.