The Midland main line from London St Pancras to the north of England is one of Britain's most important trunk routes. With its various loops and branches, this major artery of communication links busy centres of population such as Leicester, Derby, Nottingham, Sheffield, Manchester and Leeds. Notwithstanding its obvious importance as a busy main line, the Midland route was built in piecemeal fashion, the various sections (from London northwards) being...