The Midland was initially uninterested , but then realized that the branch could be extended to Rowsley . This was difficult , but the branch could avoid the section from Ambergate , on its Manchester , Buxton , Matlock and Midlands Junction Railway , which was shared with its rival the London and North Western Railway . The Midland was initially unenthusiastic , but then realized that the branch could be extended to Rowsley , albeit with difficulty , avoiding the section from , on its Manchester , Buxton , Matlock and Midlands Junction Railway , which was shared with its rival the London and North Western Railway .