While the various rival schemes were unsuccessful in obtaining parliamentary approval, the B&PCR was unsuccessful in raising the funds needed to construct its line. It was not until after the B&PCR had been taken over by Charles Yerkes's Metropolitan District Electric Traction Company that the money became available. Tunnelling began in 1902 shortly before the B&PCR was merged with the Great Northern and Strand Railway to create the Great Northern, Piccadilly and Brompton Railway (GNP&BR, the predecessor of the Piccadilly line).