- May 23
- 1837 – Anatole Mallet, inventor of the mallet locomotive type, is born (d. 1919).
- 1927 – Henry E. Huntington, nephew of Collis P. Huntington and executive in charge of Pacific Electric in the early part of the 20th century, dies (b. 1850).
- 2000 – General Motors Electro-Motive Division delivers to the Union Pacific Railroad the first five EMD SD70M diesel locomotives (pictured) in the largest single order (1,000 locomotives) for diesel locomotives ever by a single railroad.
- 2005 – Twelve Chinese railroad workers are rescued after being trapped in a collapsed tunnel for six days. Rescuers were able to transfer milk and oxygen to the trapped workers through a ventilation tube until the collapse was penetrated.
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