Following the purchase of the DR by the Underground Electric Railways Company of London in 1902, the planned DR and B&PCR lines were merged with a third proposed route from the Great Northern and Strand Railway.
Efter MDR blev opkøbt af Underground Electric Railways Company of London i 1902, blev de planlagte MDR og B&PCR-linjer koblet sammen med en tredje foreslået rute fra Great Northern and Strand Railway.