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Not only is this APOD somewhat 'off topic'; it is a repeat! Check out APOD for 22 Nov 2006 to see exactly the same picture with the same caption.
By way of interest, the excavator, which is a similar design to some used in Victoria's brown coal mines, would probably weigh 10,000 - 15,000 tonnes, and the whole superstructure that slews around (ie. your ED80 mount) would weigh many thousands of tonnes. Our much smaller versions slew on a giant bearing comprised of hundreds of 200 mm diameter steel balls.
The excavator would be powered by a long high-voltage trailing cable, and would be travelling to a new coal field - most likely.
Chris
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