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简要介绍美国各货运铁路公司为满足运量增长趋势和排放标准的需要而纷纷加快实施其短期机车购置/租赁计划的情况。
Briefly introduce the cases in which various freight rail corporations in the United States have accelerated the implementation of their short-term motorcycle purchase / rental plans to meet the demand of traffic volume growth and emission standards.