Between 1985 and 1996, for example, America's freight railways dramatically reduced their employment, trackage, and their fleets of locomotives—while increasing the amount of cargo they hauled.
At present, power electronics technology is quickly extending and applying to the implements for trackage traction and navigations.
当前，电力电子技术正在航行器具中迅速推广应用。
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Between 1985 and 1996, for example, America's freight railways dramatically reduced their employment, trackage, and their fleets of locomotives - while increasing the amount of cargo they hauled.