I was amazed sometime ago, when saw this model for the first time, so it has been in my post queue since awhile.
It is a 1:42 scale LEGO model from world's largest hydraulic shovel (Terex RH400) and a creation from the LUGPol member Zbiczasty.
This 4Kg LEGO model is powered with 4 motors and 14 pneumatic cylinders, and reproduces quite accurately the original monster functions, as you can see from the video above.
It features drive, steering, an impressive arm movements recreation and even the open/close shovel mechanism.
You may find more images at Zbiczasty's BS folder, however lets enjoy just a few extra deeplinks below.
Massive, isn't it!?