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随着向轻型车辆以及向大轴重货车和高速客车方向的发展，需要有更大的制动功率，德国联邦铁路（DB）开始研究产生制动力的新方法。
With the development towards light vehicles and large axle trucks and high-speed buses, greater braking power is required and the German Federal Railroad (DB) begins to study new ways of generating braking force.