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May 20, 1852 The Michigan Central is completed to Calumet (Kensington) south of Chicago, forming an unbroken line from Detroit. It enters the city over the Illinois Central from Calumet to 22nd Street after Illinois refuses to grant the MC an Illinois charter. (Some sources say 5/21, others say 5/22)

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May 20, 1926 In the U.S., the Railway Labor Act becomes law.

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May 20, 1983 Canadian National abandons its Haliburton Sub.

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Mark Tomlonson