Motors shall be capable of withstanding up to 15 starts per hour with a 1.0 Service Factor.

电机应该能够经受住每小时高达15次的启动，安全系数最低为1.0。

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America would benefit more from 10 train lines that can go 150 miles per hour than one that can go 250. Operating speed, which is the third most valued factor in this ranking, is more useful.

美国从10条150英里每小时的铁路获得的收益远高于1条250英里每小时的铁路，因此评分中排在第三位的运行速度才更加有用。

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