According to Caterpillar, the D7E track-type tractor's innovative electric drive system will deliver 25 percent more material moved per gallon of fuel than the D7RII. The integrated power train on the crawler dozer is also said to reduce fuel consumption by up to 20 percent (gallons per hour). A 235-horsepower Cat C9 diesel drives a generator to produce electricity that ultimately powers two AC electric drive motors, which are connected to a differential steering system, final drives, and a low-sprocket undercarriage. The electric drive train has 60 percent fewer moving parts compared to previous D7s. The system also provides power to auxiliary components, eliminating engine belts. The D7E is the first electric drive dozer using modern AC technology. Estimated list price: $550,000 to $650,000. See our video report.