Caterpillar Inc. is a manufacturer of construction and mining equipment, diesel and natural gas engines, industrial gas turbines and diesel-electric locomotives. The Company operates through segments, including Construction Industries, which is engaged in supporting customers using machinery in infrastructure, forestry and building construction; Resource Industries, which is engaged in supporting customers using machinery in mining, quarry, waste and material handling applications; Energy & Transportation, which supports customers in oil and gas, power generation, marine, rail and industrial applications, including Cat machines; Financial Products segment, which provides financing and related services, and All Other operating segments, which includes activities, such as product management and development, and manufacturing of filters and fluids, undercarriage, tires and rims, ground engaging tools, fluid transfer products, and sealing and connecting components for Cat products.