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为适应铁路运输提速重载的需要,新造货车从2003年起全部装用转K2、转K4和转K6型等提速转向架,既有货车也开始相应的提速改造,以使车辆达到120 km/h商业运行速度的要求。为保证运行安全,所有提速车型必须通过动力学试验和相关审查论证后方可投入批量生产。根据GB/T 5599—1985《
In order to meet the need of speeding and overloading of railway transportation, the newly-built trucks have all been equipped with speed bogies such as K2, K4 and K6 since 2003, and the existing trucks have also started the corresponding speed-up transformation so that the vehicles reach 120 km / h Commercial speed requirements. In order to ensure the safety of operation, all speeding models must pass the dynamic test and relevant examination and verification before they can be put into mass production. According to GB / T 5599-1985 "