Classic Machines TractorsClassic Machines: Caterpillar’s first D9 tractorCharles FairbairnMarch 28, 2016November 7, 2018 by Charles FairbairnMarch 28, 2016November 7, 2018 When released in 1955, the Caterpillar D9D was one of the world’s largest and heaviest track type tractors, only exceeded in size by the Euclid
