Alstom SA (Alstom) is a marketer and developer of transport systems. It offers tramways, metros, suburban and regional trains, high-speed and very high-speed trains, locomotives, and components. The company also provides infrastructure and integrated system solutions, modernization, maintenance, parts and repair and support services for the transport sector. Alstom offers signaling solutions such as trackside signaling solutions, interlocking and digital solutions, passenger information, train control systems, security and control systems. It operates through a network of offices, business alliances, engineering centers and manufacturing sites, warehouses, and maintenance centers across Europe, Asia-Pacific, Americas, Middle East and Africa. Alstom is headquartered in Saint-Ouen, France.