PARIS, March 30 (Reuters) - French construction and concessions group Vinci won a 7.2 billion euro ($9.7 billion) contract to build a high-speed train line between Tours and Bordeaux in western France, beating rivals Bouygues and Eiffage. France's rail body Reseau Ferre de France (RFF) announced its decision on Tuesday, sending Vinci shares up 0.8 percent at the close, while Bouygues dropped 0.4 ...