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This is an "elephant foot" Barco Tamper.  These are pretty hard to find since they're quite dangerous to use; this particular one is from Canada.  It's a gasoline engine, and when the piston fires, it throws the whole thing up into the air.  I have a 6 second .avi format digital movie of the tamper running... click here to watch.

After I got home, I discovered that I accidentally shot the movie with the camera turned sideways- you have NO IDEA what I went through to reorient it for the movie above!!  :-)