No, this enormous diesel powered beast is not a discarded movie prop from James Cameron's Aliens. He is Otto, one of the two huge transporters of the Atacama Large Millimeter Array radio telescope field, at the high site of Chajnantor Plateau, Atacama Desert, Chile.
Otto, and his twin, Lore move the 12-meter, 95-ton dishes across the Chilean plateau. Both transporters were specially designed and built for the ALMA. You can read more about them in a previous Gizmodo article: