Operation
Each unit consisted of four cars: two powered driving motors at each end and two non-powered trailers in between. Each unit was further divided into two sets, consisting of a driving motor and trailer that are semi-permanently coupled. The A Stock operated in a two-unit formation of eight cars on the Metropolitan Line, between Aldgate and Amersham, Chesham, Uxbridge and Watford stations.
When built they had a top speed of 70 mph (110 km/h) (world's fastest 4-rail train), but from the late 1990s/early 2000s they were restricted to 50 mph (80 km/h) to improve reliability. However they still had the highest top speed of any stock on the London Underground network. During the farewell tour on 29 September 2012, the 8 car train was unofficially recorded as travelling at 74 mph (119 km/h).
Read more about this topic: London Underground A60 And A62 Stock
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“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)