During the early 20th century St Louis was the fourth largest US city, larger than Boston. It was also the home of the world’s fair in 1904. This map uses the simple premise of the city decides to build a metro line to connect Union Station with the fair grounds in Forest Park. Building new metro systems was the style back then in the United States. Further construction in the following decades has left the St Louis metro area with a transit system that is smaller than Boston’s MBTA but still quite robust for a city of this size. the MBTA also stood in for inspiration for the style of the map.