Wear Valley, Bishop Auckland and Weardale, Weardale Extension, and Wear and Derwent Railways, and Shildon Tunnel Amalgamation [electronic resource] : an act for enabling the Wear Valley Railway Company to purchase or lease the Bishop Auckland and Weardale Railway, the Wear and Derwent Railway, the Weardale Extension Railway, and the Shildon Tunnel, and to raise an additional sum of money, and for other purposes