 Seating 32 in a heated saloon accessed by centre and end swing doors, these were the first tube cars without end gates.However, work on the line was stopped by the outbreak of World War I in 1914 and the 22 vehicles that had been received in 1915 were stored until 1917 when they were lent to the Bakerloo line.These ran on the extension to Watford Junction with Piccadilly line trailers until 1920/21 when they returned to the Central London.