芝加哥軌道交通
參考資料

↑  Krambles & Peterson (1993)，第16頁. sfnp模板錯誤: 無指向目標: CITEREFKramblesPeterson1993 (幫助)
↑  Borzo (2012)，第15–18, 23–24, 59–66頁. sfnp模板錯誤: 無指向目標: CITEREFBorzo2012 (幫助)
↑  Borzo (2012)，第161-163頁. sfnp模板錯誤: 無指向目標: CITEREFBorzo2012 (幫助)
1 2  In re Chicago Rys. Co., at 62.
↑  Krambles & Peterson (1993)，第20頁. sfnp模板錯誤: 無指向目標: CITEREFKramblesPeterson1993 (幫助)
↑  Maltbie, Milo Roy (ed). . Chicago: The Civic Federation of Chicago. 1901: 80.
↑  Wilcox, Delos F. . New York: The Engineering News Publishing Company. 1911: 465–470.
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1 2 3 4  Borzo, Greg. . . Chicago: Arcadia Publishing. 2007: 23–34. ISBN 978-0-7385-5100-5.
1 2 3  Moffat, Bruce G. . Discover Live Steam.   [2007-12-28]. （原始内容存档于2007-10-26）.
↑  Cudahy, Brian J. Destination Loop. Brattleboro, Vermont: Stephen Greene Press; 1982. p.13
↑  .   [2024-03-14]. （原始内容存档于2022-08-15）.
↑  Street Railway Journal. . New York: McGraw Publishing Company. 1905: 52.
↑  Garfield, Graham. . Chicago "L".org.   [2008-01-27]. （原始内容存档于2008-01-20）.
↑  Garfield, Graham. . Chicago "L".org.   [2008-01-27]. （原始内容存档于2010-07-28）.
↑  Garfield, Graham. . Chicago "L".org.   [2008-01-27]. （原始内容存档于2008-02-28）.
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↑  . Chicago Daily Tribune. 1957-11-29: A2.
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↑  . Chicago Daily Tribune. May 7, 1895: 12.
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1 2  C.E.R.A. . Central Electric Railfans' Association. 1961: iv–v.
↑  Peffers (1993)，第17, 216-219頁.
↑  . Chicago Daily Tribune. October 11, 1897: 11.
↑  Buck, Thomas. . Chicago Daily Tribune. February 25, 1951: 1.
↑  Humboldt Park branch （页面存档备份，存于） Chicago "L".org. Accessed August 16, 2013
↑   (地图). Chicago Transit Authority. 1954  [2013-08-18]. （原始内容存档于2018-09-29）.
↑  Graham Garfield. . Chicago-'L'.org.   [August 10, 2010]. （原始内容存档于2010-08-27）.
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1 2  Freeburg, Russel. . Chicago Daily Tribune. June 22, 1958: 3.
↑  Papajohn, George. . Chicago Tribune. September 4, 1984: A1.
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↑  . Chicago Daily Tribune. January 3, 1900: 5.
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1 2  Brown Line: Ravenswood branch （页面存档备份，存于） Chicago'L'.org. Accessed August 21, 2013
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↑  . Chicago Daily Tribune. April 3, 1912: 9.
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↑   (新闻稿). 新世紀電視台. June 16, 2017  [2018-02-01]. （原始内容存档于2019-08-25）.
↑  .   [2021-09-29]. （原始内容存档于2024-01-19）.
1 2  Chicago Rapid Transit Company. .   [2024-03-14]. （原始内容存档于2024-03-14）.
↑  Graham, Garfield. . Chicago "L". chicago-l.org.   [April 8, 2013]. （原始内容存档于2023-08-03）.
↑  Chicago Transit Authority. .   [2021-09-29]. （原始内容存档于2023-01-23）.
↑  .   [2021-09-29]. （原始内容存档于2023-11-14）.
1 2   (PDF). Transitchicago.com.   [2019-09-13]. （原始内容存档 (PDF)于2020-11-19）.
↑  This figure comes from the sum of the following figures from the accompanying reference (i.e. . CTA. Spring 2014  [January 18, 2015]. （原始内容存档于2016-12-19）. ): 35.8 miles of elevated route, 35.0 miles at grade level, 20.6 miles on embankments, and 11.4 miles of subway.
↑  .   [2012-06-15]. （原始内容存档于2012-10-06）.
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↑  密歇根州交通部.  (PDF).   [2020-08-02]. （原始内容存档 (PDF)于2017-03-03） （英语）.