Right now only three countries in the world have the capability to accept responsibility for construction-- Japan (with its SKS "new line" system), France (with the TGV "bullet train" system), and Germany (with its ICE system, less than two years on the market).
例如高速鐵路，目前全世界只有三個國家有承製能力，分別是日本的 SKS 系統（新幹線）、法國的 TGV 系統（子彈列車），以及問世不過兩年的德國 ICE 系統。