The trains were filmed in Germany near Hamburg (two ICE trains of different types and a train used only on Hamburg's S-Bahn). Somehow the third train's speed seems off. A track worker working alone on a busy mainline is off, too (they work in teams, with one guy doing watchout & warning). I'm sure it is a fake -- nd so say some on the original German YouTube posting (though I can't make out the details in shadow and shoe movements that caught their eye).

_{*Lunatic*, n.
One whose delusions are out of fashion.}