The first-class compartment is situated at the front of the train.

头等车厢位于火车的前部。

《牛津词典》

This inequality, in which an enormous segment of the population struggles while the fortunate few ride the gravy train, is a world-class recipe for social unrest.

当幸运的少数人可以轻易地赚大钱的同时，很大一部分人却在吃力地生活，而这样的不平等就成为了社会动荡的必然因素。

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I took my seat I a third-class carriage of a deserted train. After an intolerable delay the train moved out of the station slowly.

我坐在一列空荡的火车的三等车厢，忍受完漫长的等待，火车终于开始缓缓的驶离车站。

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The long-term aim, however, is to use it to train a group of world-class African sculptors.

ECONOMIST: Rwenzori Sculpture Foundation

Two bombs went off on a commuter train between India and Pakistan in the low class segment of the cars. 75 people were killed and burned to death.

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The smartening-up of these working-class neighborhoods -- with their cheap rent, relatively large spaces and newly opened train lines -- was inevitable in a way, but it has only added to, not dimmed, the cacophony of eclectic voices ringing through the streets.

CNN: Why gritty East End is London's gold standard