After celebrating the 100th anniversary of its track-type tractors in 2004, Caterpillar announced its T-Series track-type tractors. The machines meet Tier III emissions requirements and have full electronics integration. Models D8T, D9T and D10T have plug-and-play capability with future machine automation and efficiency-improving attachments, says the company. ACERT engines are used in the series: 347-hp C15 in the D8T, 464-hp C18 in the D9T, and 646-hp C27 in the D10T. All have electronically controlled, heavy-duty planetary powershift transmissions with large-diameter, high-capacity, oil-cooled clutches. Estimated list price: $476,650 to $851,470.