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柳铁科研所研制的可封闭式加减速顶是一种用于驼峰编组场目的制动的调速工具，于1986年通过了铁道部技术鉴定。在此基础上，我们新近又研制了节能加减速顶。本文即是介绍这种新型调速工具的结构原理和性能特点。
The enclosed acceleration and deceleration top developed by the Institute of Technology, Liuzhou Iron and Steel Research Institute is a speed-adjusting tool for braking the field of hump formation. It passed the technical appraisal of the Ministry of Railways in 1986. On this basis, we have recently developed energy-saving acceleration and deceleration top. This article is to introduce the structural principle and performance characteristics of this new speed control tool.