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
Set square Set square A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. More commonly the set square bears the markings of a ruler and a half circle protractor. The outer edges are typically bevelled. These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with