WEST FARGO, N.D. — In 1925, Caterpillar Tractor Company was formed to build steam- and gas-powered farm equipment to replace machines run by horses. To celebrate 100 years, the company is bringing its Centennial Tour to locations across the company, including recently to West Fargo, where employees got to see the company's history in a traveling display. "We're letting all our employees be part of a celebration.