History of the London Underground to determine the cause. Following the incident, a system that stops a train automatically if the driver fails to brake was introduced at dead-ends on the London Underground. The Northern City Line was connected to British Rail tracks at Finsbury Park in the 1970s. The last tube train ran in October 1975, and British Rail services began in 1976. In 1977, the Piccadilly line was extended from Hounslow to Heathrow Airport, and in 1986 a platform serving Terminal 4 opened on a loop line. The Fleet line through central London was first proposed in 1965, taking over the Bakerloo line's
City of London (elections to the Parliament of England) longer a legal requirement, there was a custom that two City seats were filled by Aldermen and two by non-Aldermen. During the Protectorate the City was allocated six seats in the House of Commons, under the terms of the Instrument of Government adopted on 15 December 1653. However, by the time the Third Protectorate Parliament assembled in 1659 the constituency had reverted to its traditional four seats. The "City of London" was a densely populated area in the period up to 1707. The composition of the City electorate was not as democratic as that of some other borough constituencies, such