Through this equivalent stiffness, the mechanical model of wheel-tract system in the new light train with rubber wheels can is simplified by treated the rubber wheel as a tri-axial spring.

引入等效刚度系数，将轮缘橡胶等效为三向弹簧，从而简化新型轻轨列车系统的力学模型。

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For example, one train mistook a bright star for a white light and something unexpected happened.

例如，一列火车把一颗明亮的星星误认为白光，然后发生了意想不到的事情。

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We can see the light at the end of the tunnel, and we're pretty sure it's a train about to run us over.

我们能够看到隧道尽头的光，并且相当肯定那里会有一趟列车要载我们脱离困境。

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The yardmaster assumed he was saving the company money by not using a crew and fuel to run a light train.

FORBES: Magazine Article

If a yardmaster was faced with a so-called light train, one with just 60 cars, he might let it sit in the yard for another day until another 60 cars bound for the same location came in.

FORBES: Magazine Article

Unfortunately, few U.S. airports rarely offer the ease or public transport connections into their affiliated cities that Heathrow does, but one rare exception is Salt Lake City, a major Delta hub, which just this week debuted TRAX, a light rail train into downtown.

FORBES: Long Airport Layovers Can Be Vacations, Not Hassles