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The Shen Express

 

Harry would see seven "Shen Express" trains go past in the opposite direction.
Let's say that Harry travelled on the "Shen Express" on Wednesday 10:00PM from Ronville. The first train he would have crossed is the one scheduled to arrive at Ronville at 11:30 PM the same day i.e. the one that left Gothamville at 10:00 PM on last Sunday.
He will pass 7 other trains before arriving at his destination. The first, he will see approximately 45 minutes after departure. Then he will see one train approximately every 12 hours for three days. This is because the trains leave from each end of the track once every 24 hours travelling toward each other.
Also, he would have crossed the last train just before reaching Gothamville on Saturday.

Thus, Harry must have crossed 7 "Shen Expresses" during his journey.

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