September 17 – The first of the 6000-seriesrapid transit cars (6001–6720), are placed in service on the Chicago "L" system. built by the St. Louis Car Company of St. Louis, Missouri, the number of these cars would eventually reach 720, dominating the CTA's fleet for decades. The first batch is placed in service on the Logan Square route.
^Mills, John M. (1977). Traction on The Grand: The Story of Electric Railways along Ontario's Grand River Valley. Railfare Enterprises. p. 24. ISBN0-919130-27-5.
^ ab"San Bernardino Line". Electric Railway Historical Association. Retrieved 11 September 2020.