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Caterpillar offers the D7E AC electric drive track-type tractor. The electric drive system developed for track-type tractors gives the D7E power, efficiency, control and maneuverability. From an environmental sustainability perspective, the D7E uses substantially less fuel per hour dramatically reducing the amount of carbon dioxide emissions. All major components are engineered to be rebuilt or reused in the future. The D7E is in the 60,000-pound (27 000-kilogram) weight range and is powered by a Cat C9 engine producing 235 horsepower (175 kilowatts). A traditional mechanical transmission is not needed, because the variable speed electric motors serve the function of a continuously variable transmission. The electric drive train has 60 percent fewer moving parts compared to previous D7s. The electric system also provides power to auxiliary components so that no engine belts are needed.