Companies in Saint-Ouen-sur-Seine

Alstom's roots reach back to 1928, when the French engineering firm Als-Thom (a merger of Alsacienne and Thomson-Houston) began building locomotives — but the company's defining era came after 2014, when it acquired the transport division of its own would-be acquirer, General Electric, and became the world's second-largest train maker. In 2021 it swallowed Bombardier Transportation, cementing a position alongside China's CRRC as the global rail duopoly. The company's portfolio covers the entire rail spectrum: high-speed trains (its TGV family defined French speed records and its derivatives run in Spain, Italy, Morocco, and the US), regional and commuter trains, metros (its driverless trains operate in many cities), trams, and the signaling and traffic management systems that control rail networks. Its maintenance contracts keep fleets running for decades after delivery. Headquartered in Saint-Ouen near Paris with about 80,000 employees and annual revenue near €17 billion, Alstom is betting on rail as the climate solution — electrified trains produce a fraction of the emissions of road transport. For cities and national railways, Alstom is the supplier that can deliver everything from a single tram to a complete high-speed corridor, financed, built, and maintained.