Railway rail robot fastener - GIF

Railway rail robot fastener.

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Previously:

1964 shunting horse for pulling railway carriages - video
Desert railway - photo
Tilting railway car unloading ramp - GIF
WW1 US railway gun - photo
Worden Park miniature railway - GIF
wartime railway and train sabotage techniques

Should put one on each rail. Tighten two at a time.

doesn't seem to be faster than an air wrench.

The bolts were already started by someone at some point, so why weren't they just tightened all the way at that time?

Perhaps they loosen over time? lots of stress on track components.