Caterpillar engages in the manufacture of construction and mining equipment, diesel and natural gas engines, industrial gas turbines, and diesel-electric locomotives. It operates through the following segments: Construction Industries, Resource Industries, Energy and Transportation, Financial Products, and All Other. The Construction Industries segment supports customers using machinery in infrastructure and building construction applications. The Resource Industries segment is responsible for supporting customers using machinery in mining and quarrying applications and it includes business strategy, product design, product management and development, manufacturing, marketing and sales and product support. The Energy and Transportation segment supports customers in oil and gas, power generation, marine, rail, and industrial applications. The Financial Products segment offers a range of financing alternatives to customers and dealers for Caterpillar machinery and engines, solar gas turbines, as well as other equipment and marine vessels. The All Other segments include activities such as; the business strategy, product management and development, and manufacturing of filters and fluids, undercarriage, tires and rims, engaging tools, and fluid transfers.