Construcciones y Auxiliar de Ferrocarriles, S.A. develops and sells rail and bus transport solutions in Spain, rest of Europe, the United States, the Asia-Pacific, and internationally. It offers trains, buses, components, signaling systems, and turnkey mobility solutions. The company also provides rolling stock equipment and components; simulators; and aeronautical and digital mobility solutions. In addition, it offers repair and maintenance, engineering, and lease and marketing services. The company was formerly known as Compañía Auxiliar de Ferrocarriles S.A. and changed its name to Construcciones y Auxiliar de Ferrocarriles, S.A. in 1971. Construcciones y Auxiliar de Ferrocarriles, S.A. was incorporated in 1917 and is headquartered in Beasain, Spain.