In order for the Northbound fly to switch from northbound motion to southbound motion, it would have to come to a complete stop before it can begin motion in the opposite direction. Correct?

Yes

If the fly is then going zero miles per hour, and it is in contact with the trains windshield... then by definition, wouldn't the train also be going zero miles per hour, if even for a tiny fraction of a second

the train never changed direction. Now if the fly were the size of godzilla, then the scenarios would be reversed

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