Featuring a new electronic C9 engine, Caterpillar's D6R Series II track-type tractor meets all current worldwide emissions regulations. It features an electronically controlled, hydraulically actuated direct-injection fuel system that improves fuel economy and reduces emissions. The C9, coupled with the company's ACERT technology, will allow the machine to be compliant with the upcoming EPA Tier III regulations, Cat says. The Series II retains the best features of the D6R, including modular components, elevated sprocket design, Advanced Modular Cooling System, and differential steering option. The new machine also has numerous power train, cab and serviceability improvements. Estimated list price: $210,000 to $270,000.