There have been several papers over the years which have addressed this subject. It is not intended to repeat this material, but to expand upon it, and review some of the later developments. The concept of a central brake unit controlled by pilot signals from each cab goes back to the late 1960's, early 1970's. The first electronically controlled indirect automatic air brake utilising the central brake unit with electrical control signals from the cab was the E70 equipment fitted to the British Rail (B.R.) High Speed Trains (HST/IC 125) and the Class 56 freight locomotives (fig. 1). This was utilised in the Union internationale de chemins de fer `UIC' graduated release environment.
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机译：多年来有几篇论文已经解决了这个主题。它不旨在重复这种材料，而是为了扩大它，并审查一些后期的发展。由每个驾驶室的导频信号控制的中央制动单元的概念返回到1960年代后期，早期。利用来自驾驶室的电控制信号的第一电子控制间接自动空气制动器是来自驾驶室的E70设备，适用于英国轨道（BR）高速列车（HST / IC 125）和56级货运机车（图。 1）。这是在Union Internationale de Chemins de FER` UIC'毕业的释放环境中使用。
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