New trains were delivered before the outbreak of World War II in 1939, including 573 cars for the District and Metropolitan lines and 1,121 new cars (1938 Stock) for the tube lines. Following the outbreak of war, services on the Northern line between Strand (now Charing Cross) and Kennington were suspended as the tunnels under the Thames were blocked as a defence against flooding. The Metropolitan Pullman cars were placed into store and first class was removed from London Underground services. The New Works Programme continued, albeit at a reduced pace, the Bakerloo line taking over the Stanmore branch from the Metropolitan in November 1939. The Northern line reached Mill Hill East in May 1941, but by then work on the other Northern and Central line extensions had been suspended. The bombing of London and especially the Blitz led to the use of many tube stations as air-raid shelters, with 175,000 people arriving every night in August 1940. Six stations were breached by a direct hit, and in March 1943, 173 people died in a crowd crush accident at the unfinished Bethnal Green station. In the 1940s a depot built for the Northern line extension and an unfinished stretch of the Central line extension, the underground section between Newbury Park and Leytonstone, was turned into aircraft factory. The closed Brompton Road station was used as an anti-aircraft control room. The closed Down Street station was used by Winston Churchill and the War Cabinet and the Railway Emergency Committee.