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
Reactions to the 2005 London bombings 2001 attacks.) Reactions to the 2005 London bombings The 7 July 2005 London bombings were a series of suicide attacks carried out by homegrown terrorists on London's public transport network during the morning rush hour. The bombings, three on the London Underground and one on a bus, killed 52 people and prompted a massive response from the emergency services, and in the immediate aftermath the almost-complete shut down of the city's transport system. Over the following hours and days there were several security alerts throughout the United Kingdom, and in some foreign cities. London largely returned to normality in the