Safety on the London Underground The earliest attack on the London Underground was in 1885, when a bomb exploded on a Metropolitan line train at Euston Square station. The Provisional IRA (and its predecessors) carried out over ten separate attacks between 1939 and 1993. As a response to growing 'Mumbai-Style' terrorist attack threats, the British Transport Police has its own detachment of armed officers who will regularly patrol both the Underground’s stations and its trains. Various regulations aim to improve safety on the Tube. Smoking was allowed in certain carriages in trains until 9 July 1984. In the middle of 1987 smoking was banned for
London Underground GN&C Stock Heath. These plans were curtailed by World War II and the Northern City line (or "Highbury Branch") continued operating with 1938 Stock until 1975, when the line was transferred to British Rail. Since 1976 the line has been operated exclusively by British Rail Class 313 electric multiple units. London Underground GN&C Stock The GN & C Stock was operated on the Great Northern and City Railway, an underground railway line in London, England. It was opened between Moorgate and Finsbury Park on 14 February 1904. The original GN&C Stock operated on the line between 1904 and 1939. The line was