History of the L By aoliver13 1890 Privately Operated Train lines in use These trains dropped people off outside the business district at "The Loop" Jun 6, 1892 First L Train Ran 1893 Chicago and South Side Rapid Transit Railroad extended line to Jackson Park 1897 The first full circuit of the Loop completed 1943 State Street Subway, now part of the Red Line, opened Oct 1, 1947 The CTA ran all operations of L trains and streetcars 1951 The Dearborn Street Subway, now part of the Blue Line, opened
