The Tohbu Kyuryo Railway Line links key stations of Higashiyama Line which traverses the center of Nagoya City. There were sites of EXPO 2005 Aichi along the Railway Line. Total length of the Line was approximately 9km with 9 stations.

This project was located in the congested outskirts of Nagoya City. Judging from underground & above ground geological conditions and existing underground structures, the employer, Aichi Prefectural Government, came to the conclusion that DOT (Double O Tube) method was the most suitable. Daiho Corporation utilized the shield tunnel system to complete the project to the employer`s satisfaction. Tunneling details are as follows;