1879: Société Alsacienne de Constructions Mécaniques (SACM) opens a locomotive manufacturing site in Belfort.
1928: CFTH (Compagnie Française Thomson-Houston), French subsidiary of General Electric, and SACM merge part of their electrical engineering and rail transport activities to create a joint subsidiary, Als•Thom.
1932: Alsthom merges with Constructions Électriques de France (CEF), a rail equipment and locomotive construction company.
1969: CGE (Compagnie Générale d’Electricité) becomes Alsthom’s main shareholder. Following the integration of CGEE, Europe’s biggest electricity company, Alsthom now employs over 50,000 people and accounts for one third of CGE’s revenues.
1976: Alsthom merges with Chantiers de l’Atlantique and changes its name to Alsthom Atlantique.
1978:The factory at Belfort delivers the first TGV pre-series train set to SNCF.
1979:Alsthom reorganises its activities: naval construction becomes the third division, alongside the ones dedicated to the production of electricity and rail transport.
1981: Le TGV between Paris and Lyon is inaugurated on a high speed line specially constructed for this purpose.
1982: Nationalisation of CGE, which will be privatised once again in 1987.
1985: Alsthom Atlantique changes its name back to Alsthom.
1988: CGE and the British conglomerate GEC announce Alsthom’s merger with GEC Power Systems. The new group, held equally by the two parties, is baptised GEC Alsthom (79,000 employees).
1990: The TGV Atlantique reaches 515.3 km/h, beating the world speed record for rail.
1991: CGE becomes Alcatel-Alsthom.
1998: Alsthom becomes Alstom and is listed on the stock exchange by Alcatel and GEC.
1999: Alstom and ABB merge their Power divisions into a single company, ABB Alstom Power, later to become Alstom Power in 2000.
2003: The Group is in difficulty but receives support from the French government, which becomes a shareholder. As part of a restructuring plan approved by the EU competition authorities, Alstom is obliged to cast off 40% of its activities.
Chantiers de l’Atlantique delivers the Queen Mary 2, the largest transatlantic ocean liner ever built, to Cunard Carnival.
2004: Alstom sells its Transmission and Distribution activity to Areva.
2006: Alstom sells 75 % of its subsidiary Alstom Marine to Aker Yards (Norway). The French civil engineering company Bouygues buys a 21% share in Alstom’s capital from the State, later bringing it up to 31%.
2007: Alstom sets a new rail world speed record with 574.8 km/h.
2010: Alstom and Schneider Electric buy Areva T&D, the Transmission and Distribution division sold by Alstom to Areva in 2004. Alstom then buys the Transmission activity to create a third sector, Alstom Grid.
2011: Alstom reorganises its operational activities into four sectors: Thermal Power, Renewable Power, Grid and Transport.
2014: On 19 December, an extraordinary shareholders’ meeting held by Alstom’s shareholders approves the proposed sale of Alstom’s Energy activities to General Electric.
2015: The transaction is finalised and Alstom refocuses on its transport sector.