Westinghouse Air Brake Technologies Corporation, doing business as Wabtec Corporation, provides technology-based equipment and services for the rail industry. The company operates through two segments, Freight Group and Transit Group. The Freight Group manufactures and services components for new and existing freight cars and locomotives, builds new switcher locomotives, and rebuilds freight locomotives, as well as provides related heat exchange and cooling systems. The Transit Group manufactures and services components for new and existing passenger transit vehicles, typically subway cars and buses, builds new commuter locomotives, and refurbishes subway cars. WAB companys principal component product lines include railway braking equipment and related components; freight car truck components and undercarriage components; draft gears, couplers, and slack adjusters; air compressors and dryers; positive train control equipment and electronically controlled pneumatic braking products; railway electronics, including event recorders, monitoring equipment, and end of train devices; friction products, including brake shoes and pads; rail and bus door assemblies; accessibility lifts and ramps for buses and subway cars; heat exchangers and cooling products for locomotives and power generation equipment; commuter and switcher locomotives; and transit car and locomotive overhauls. In addition, it designs and builds electronic instrumentation devices for rail and transit markets and manufactures railroad track and signaling products. The companys customers include railroads and passenger transit authorities in North America, as well as in the United Kingdom, Australia, Europe, Asia, and South Africa; manufacturers of transportation equipment, such as locomotives, freight cars, subway vehicles, and buses; and lessors of such equipment. WAB company was founded in 1869 and is headquartered in Wilmerding, Pennsylvania.