In 1913 the Bakerloo line reached Paddington, and the following year the Hampstead line was extended south of its Charing Cross terminus to an expanded interchange station (currently known as Embankment) with the Bakerloo and District lines. The Bakerloo line was extended north to Queen's Park to link up with the London & North Western Railway's new electric line from Euston to Watford Junction. The start of World War I in 1914 delayed construction, trains reaching Queen's Park in 1915 and in 1917. An extension of the Central line west to Ealing was started in 1913 and, also delayed by the war, was completed in 1920. The war saw growth in traffic and a shortage of men, so women were recruited as temporary replacements in traditional men's jobs such as guards, clerks, painters and cleaners. London saw its first air raids in 1915, and people used the tube stations as bomb shelters.