Photograph of the VC-22 Sno-Freighter, which measured 274 feet in length and had a maximum payload of 175 tons. One went to work transporting supplies in Alaska in 1956.

Photograph of a 360 Electric Digger, an earth-moving machine with three large bowls filled with dirt, with large wheels and motors at either end and in between the bowls, including an operator partially visible in the center part of the vehicle. The Digger is in a large, empty dirt area and a wall of scraped dirt is partially visible at the back of the equipment, with trees visible in the far background.

Photograph of the 60-ton capacity Pacemaker Series L-67 Electric Digger, first introduced in March 1960, according to Eric C. Orlemann. Its payload capacity was 60 tons.

Photograph of a Series K-205 diesel-electric-drive tractor-dozer, the largest and most powerful dozer of its day, according to author Eric Orlemann. The dozing blade was 20 feet wide, and the overall working weight of the K-205 was 160 tons. Only one of these massive machines was ever produced.