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Image: 2019-12-05 train illustration

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Description: There are two trains, side-by-side. One has longer cars than the other. They are both traveling at the same speed, "v". A signal post stands as a reference for sampling frequency of passing trains per a period of time.
Title: 2019-12-05 train illustration
Credit: Own work
Author: Lion Kimbro
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No

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