In France, all public tenders are listed on the official website BOAMP (Bulletin Officiel des Annonces des Marches Publics).
(The site is in French only, and responses have to be submitted in French as well)
French Government e-procurement website- Access here (in English)
SNCF- The French Rail Service Public Procurement website (in English)
TED (Tenders Electronic Daily) is the online version of the 'Supplement to the Official Journal of the European Union', dedicated to European public procurement. Search for EU tenders here
(Please go to the website and select country-FR (France), then select - Business opportunities- Design contest or Contract notice to see tender notices for public works in France)