In 1958 the region boundaries were redrawn to make them geographical rather than based on pre-nationalisation ownership. Former LMS lines in Yorkshire were transferred from the London Midland to the Eastern and North Eastern region: the London Midland region gained the former Great Central Railway lines outside Yorkshire and Lincolnshire from the Eastern Region in return. Former LMS lines in the south-west of the country, including the northern section of the Somerset and Dorset Joint Railway, were transferred to the Western region.