 In 1920, with three former colleagues from the Women's Legion Mechanical Transport Section, she started the X Garage, a car-hire and chauffeuring service that featured a women-only staff of drivers and mechanics.Carstairs (and her friends and lovers) lived in a flat above the garage, which was situated near Cromwell Gardens in London's fashionable South Kensington district.Several of the X-Garage staff had served as drivers during the war and spoke French, German, or Italian.