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https://www.crosswordclues.com/clue/columbian
[B&O train] == History == The Columbian between Jersey City and Washington was the first air-conditioned passenger train in North America. Air-conditioned equipment began operating on the train on May 24, 1931. IN 1937 the B&O re-equipped the Columbian with cars from the Royal Blue. On December 19, 1941 the B&O extended the Columbian from W...
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http://en.wikipedia.org/wiki/Columbian_(B&O_train)
[MILW train] The Columbian was a named passenger train operated by the Chicago, Milwaukee, St. Paul and Pacific Railroad (`the Milwaukee Road`) between Chicago, Illinois, and Seattle/Tacoma, Washington. The westbound train was Milwaukee Road train #17, and the eastbound train was train #18. ==The First Columbian: 1911-1930== One of the last...
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http://en.wikipedia.org/wiki/Columbian_(MILW_train)

• (a.) Of or pertaining to the United States, or to America.
Found on
http://thinkexist.com/dictionary/meaning/columbian/
Co·lum'bi·an adjective [ From
Columbia .] Of or pertaining to the United States, or to America.
Found on
http://www.encyclo.co.uk/webster/C/112

[
adj] - of or relating to Christopher Columbus
Found on
http://www.webdictionary.co.uk/definition.php?query=Columbian
adjective of or relating to Christopher Columbus
Found on
https://www.encyclo.co.uk/local/20974

pertaining to America or the United States. · pertaining to Christopher Columbus.
Found on
https://www.infoplease.com/dictionary/columbian
No exact match found.