Cummins engages in the design, manufacture, sale and service of diesel and natural gas engines and powertrain-related technologies, including fuel systems, controls, air handing, filtration, emission, solutions and electrical power generation systems. It operates through the following segments: Engine, Distribution, Components and Power Generation. The Engine segment manufactures and markets a range of diesel and natural gas powered engines under the Cummins brand name, for the heavy- and medium-duty truck, bus, recreational vehicle, light-duty automotive, agricultural, construction, mining, marine, oil and gas, rail and governmental equipment markets. The Distribution segment consists of parts, engines, power generation and service, which service and distributes range of its products and services. The Components segment supplies products which complement its Engine and Power Systems segment, including after treatment systems, turbochargers, filtration products and fuel systems for commercial diesel applications. The Power Generation segment designs and manufactures most of the components that make up power generation systems, including controls, alternators, transfer switches and switchgear.