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提高既有线行车速度是扩大运输效能一个简单而有效的措施,大势所趋,我国也开始进行。国外对既有线正积极进行改造以提高行车速度。如德国铁路根据具体情况,分别提高速度为100～160 km/h和160～200 km/h,对时速为200 km的既有线,则提高到230 km。应用新型摆式列车,不须大量加大曲线半径。从此看来,提高既有线行车速度主要问题在路基方面。铁路工程人员不论是改善旧线或新线,似应对路基工程在提高速度可能性方面看得远一些。
Improving the speed of existing railways is a simple and effective measure to expand transport efficiency. As a general trend, our country has also started to carry out its operation. Foreign countries are actively transforming the existing lines to speed up traffic. For example, according to the specific situation, the German railways increase the speeds of 100-160 km / h and 160-200 km / h, respectively, to 230 km for existing lines with a speed of 200 km per hour. Application of new tilting train, without having to greatly increase the curve radius. From this point of view, the main issue of improving the speed of existing lines is on the roadbed. Railway engineers, whether it is improving old lines or new ones, seem to be able to see subgrade projects farther away in increasing their speed.