Poster; Passengers are requested to keep the blinds drawn at night, January 1915

During the First World War, transport was an obvious target for enemy aircraft. It was thought that bombers could use tram and train lines for navigation, as both produced sparks and flashes that were visible at night. This poster was issued by the Underground in 1915. It advised passengers to keep their blinds drawn at night to limit their visibility to the enemy. This notice refers to the open air sections of the District line between Bow Road and Gloucester Road.