June 19 - Custer Creek train wreck kills at least 47 near Saugus, Montana. A bridge, weakened by a flash flood, collapses under the Milwaukee Road's Olympian plunging the locomotive and seven lead cars into the rain-swollen creek. It remains the worse rail disaster in Montana history.
July 31 - The Pennsylvania Railroad, in its public timetable issued today, boasts that “19% of all passengers are carried on the Pennsylvania Railroad.”
Web site: Whittier Line . Electric Rail Heritage Association . 17 September 2020.
Web site: Rivanna Chapter National Railway Historical Society. This Month in Railroad History: March. 27 March 2006. https://web.archive.org/web/20060417075629/http://avenue.org/nrhs/histmar.htm. 17 April 2006 . live.
Report of Survey of the Manila Railroad Company and the Preliminary Survey of Railroads for Mindanao. De Leuw, Cather & Company. Chicago. 1–12. Chapter I: Present Conditions. 1951.
Web site: San Fernando Valley Line . Electric Railway Historical Association of Southern California . 8 September 2020.
Web site: Manitou & Pike's Peak Cog Railway. 2005. Cog Railway History. 2005-06-13. https://web.archive.org/web/20050701005316/http://www.cograilway.com/history.htm. 1 July 2005 . live.
Book: Croome, Desmond F.. Jackson, Alan A.. Rails through the Clay: a history of London's Tube railways. 2nd. Harrow Weald. Capital Transport. 1993. 1-85414-151-1. 258–62.
Book: Two Feet to the Quarries . Jones, Robert C. . Evergreen Press . 1998 . 0-9667264-0-5 . 93.