Great Northern and City Railway

The Great Northern and City Railway ran between Finsbury Park and Moorgate stations. The line was constructed underground but with wide tunnels which could accommodate overland surface-gauge rolling stock, with the intention of allowing trains from the Great Northern Railway to run through to Moorgate.

The railway came under the control of the Metropolitan Railway in 1913, although plans to build an extension to connect it to the Metropolitan Line did not come to fruition. In 1935 it was taken over by the Northern Line and renamed the 'Northern City Line', becoming a branch of the 'Bank branch' of the Northern Line. In 1976 the line was transferred to British Rail and finally used for its intended purpose, when a commuter service was begun running from Moorgate to Welwyn and Hertford.