Nidd Valley Light Railway was a light railway in upper Nidderdale in the West Riding of Yorkshire, England. It was owned by Bradford Corporation Waterworks Department and the corporation also operated its public passenger services. Power & Traction Ltd of London obtained a Light Railway Order for the 6.5-mile (10.5 km) railway from Pateley Bridge to Lofthouse in 1900, but these powers were taken over by Bradford Corporation. A contract to build Angram Reservoir was awarded to John Best & Son in 1903, and he also won the contract to build the public railway and a 6.5-mile (10.5 km) private extension to the reservoir site. This was initially built to 3 ft (914 mm) gauge but was converted to standard gauge by 1907, when the public railway opened. Best had his own locomotives, and Bradford Cor