The Great Central Railway (GCR) was a railway company in England which came into being when the Manchester, Sheffield and Lincolnshire Railway changed its name in 1897 in anticipation of the opening in 1899 of its London Extension (see Great Central Main Line). On 1 January 1923, it was grouped into the London and North Eastern Railway. Today, small sections of the main line in Leicestershire and Nottinghamshire are preservedSeveral other sections of GCR lines are still in public operation.
More information on the Wikipedia page [1]