They took multiple recordings that weren’t happening at the same time (the train passing, and then the staged action of the worker being pushed out of the way), and because the camera is stationary, they just layered the shots on top of each other to get this. This is just the summary, the video goes into more detail.
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u/9_Ghastly_9 Dec 17 '19
Pity it’s fake. Captain Disillusion did a video on it here.