The Midland Railway junction opened on 13 July 1868 when services ran into Moorgate Street before St Pancras station opened. The line left the Midland main line at St Paul's Road Junction, entering a double-track tunnel and joining the Widened Lines at Midland Junction. A tunnel was built west of Midland Junction with the intent of quadrupling all the way to Paddington, but was not used until 1926. Initially services ran from the Tottenham & Hampstead Junction line to Moorgate and Victoria. From 1 July 1875 the Midland ran services from and to Victoria, the LC&DR between Victoria and Hendon.