[Governor Dinwiddie]

#5: "The subway existed before WWI."

Anyone who has seen Gary Cooper in Sergeant York will remember Alvin York's fascination when fellow soldier "Pusher" (played by George Tobias) explains to him that subway trains run underground.

[Zhang Fei]

[Anyone who has seen Gary Cooper in Sergeant York will remember Alvin York’s fascination when fellow soldier “Pusher” (played by George Tobias) explains to him that subway trains run underground.]

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Oddly enough, I vaguely recall it. The average doughboy had a pretty good chance of having seen the subway before his AEF unit shipped out to Europe since Europe-bound units departed from three areas, and two of them were part of Greater NYC:

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https://en.m.wikipedia.org/wiki/American_Expeditionary_Forces
[Since the transport ships needed to bring American troops to Europe were scarce at the beginning, the U.S. Army pressed into service passenger liners, seized German ships, and borrowed Allied ships to transport American soldiers from ports in New York City, New Jersey, and Virginia.]

[2CAVTrooper]

Awesome movie.