Always wondered how they did this. I retired from the railroad and think the track workers are one of the most important assets of the railroad!Simple tech and it works. It’s used in Australia too - simple and reliable.This isn't happening in the US. Wherever this is in the first 30 seconds there are code violations happening all over the place. Railroad company managers and supervisors get a little testy if the line workers are not wearing steel toed boots and are wearing shorts. Insurance inspectors jack rates through the roof where they catch that.