Baker Street tube station new Jubilee line was proposed which would take a route via Baker Street, Bond Street, Trafalgar Square, Strand, Fleet Street, Ludgate Circus and Cannon Street, then proceeding into southeast London. This new line was to have been called the Fleet line. The Jubilee line added an extra northbound platform and replaced the Bakerloo line service to Stanmore from the station, opening on 1 May 1979. The initial route on the Hammersmith & City line was formed by the H&CR, running between Hammersmith and Moorgate. Services were eventually extended to Barking via the DR and shared with the existing MR tracks
Trafalgar Square construction started, impeding its progress. The square was to be named for William IV commemorating his ascent to the throne in 1830. Around 1835, it was decided that the square would be named after the Battle of Trafalgar as suggested by architect George Ledwell Taylor, commemorating Nelson's victory over the French and Spanish in 1805 during the Napoleonic Wars. After the clearance, development progressed slowly. The National Gallery was built on the north side between 1832 and 1838 to a design by William Wilkins, and in 1837 the Treasury approved Wilkins' plan for the laying out of the square, but