| In 1971, construction on the Tohoku Shinkansen line and that to construct the Joetsu Shinkansen line started, and the work for the Narita Shinkansen line, as an access route to Narita airport which was under construction, also started in 1974. |
1971年に東北新幹線と上越新幹線が着工され、1974年には建設中の成田国際空港へのアクセス路線として成田新幹線も工事に入った。 |