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STAR 21并非是真正的样车,而是试验车,通过它所获得的所有数据和技术发明都被反馈回东日本铁路公司的生产系统,以便应用于将来的各型高速列车。东日本铁路公司在设计概念上的一项重大改变是在轴颈位置选用润滑脂润滑圆锥滚动轴承。先前的新干线列车则全部采用大型圆柱滚动油浴润滑
STAR 21 is not a real prototype, but a test car, through which all the data and technical inventions obtained are fed back to the East Japan Railway Company’s production system so that it can be applied to all types of high-speed trains in the future. East Japan Railway Company in the design concept of a major change is selected at the journal position Grease lubrication tapered roller bearings. The previous Shinkansen trains were all lubricated with large cylindrical rolling oil bath