热烈祝贺减速顶研制成功二十周年本刊编辑部１９７４年我国第一台减速顶研制成功至今已二十年了。减速顶从研制到广泛应用经过了艰难而又光辉的历程，克服了一个又一个困难，走上一个台阶再上一个台阶，今天取得了巨大成绩，为铁路运输现代化作出了突出贡献！让我们对减速... Warm congratulations on the 20th anniversary of the development of deceleration top Journal editorial department 1974 China’s first decelerating roof has been developed successfully for twenty years. Speed ​​reducer from the development to the extensive application of the difficult and glorious course, to overcome one after another difficulty, to a new level and then reached a great achievement today, made an outstanding contribution to the modernization of railway transport! Let’s slow down ...