Caterpillar has announced that they have shipped the the 500th D7E Track-Type Tractor. That's a surplus of 1.4 million gallons of diesel fuel saved for D7E owners. The D7E's electric drive system is the first of its kind. The D7E is up to 30 percent more fuel efficient than the previous D7 model and lowers overall operating costs to increase profits. View the complete list of machine specifications for the D7E Track-Type Tractor.