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国铁将从1985年春季开始,将东北、上越新干线的最高速度提高到240公里/时。新干线和旧线的最高速度,将分别为310公里/时和160公里/时,为达到这个目标,将进行有关的技术研究。目前,新干线仅为210公里/时,旧线为120公里/时,距所要达到的目标相差甚远,而且困难重重。为此,将分阶段逐渐实现。轮轨接触的铁路其速度限界在理论上是380～390公里/时。新干线要达到310公里/时,无疑是向轮轨接触限界速度的挑战。速度愈高走行阻力的增大就愈显著,为此,必须缩小车辆断面和改进踏面
From the spring of 1985, the state-owned railways will increase the maximum speed of the northeast and the Shang Yue Shinkansen to 240 km / h. The maximum speeds of the Shinkansen and the old lines will be 310 km / h and 160 km / h, respectively. To achieve this goal, relevant technical studies will be conducted. At present, the Shinkansen is only 210 km / h and the old line is 120 km / h, which is far from the goal to be achieved and is in a difficult situation. To this end, will be phased in gradually. The speed limit of the railroad-rail contact is theoretically 380-390 km / h. To reach 310 km / h Shinkansen, it is undoubtedly the challenge of meeting the speed limit of the wheel-rail contact. The higher the speed, the more significant the increase of the running resistance. Therefore, it is necessary to reduce the cross-section of the vehicle and improve the tread