Background: This 33.5-mile-longrail tunnel links the island of Honshu with the island of Hokkaido.
背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。
2
Based on above reasons, it has a practical significance to study the longrail transportation and design a new longrail transportation control system.
基于上述原因，对长钢轨输送控制系统进行研究，并设计新型的长钢轨输送控制系统具有现实意义。
3
A kind of longrail measurement, based on wedge-shaped plate interference, has been developed, which is one of the important branch of geometry measurement.