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载客空调火车大约30年前就出现了。今天在美国,除某些地铁外,所有新造的火车都全部装备空调。在一些国家,例如加拿大和墨西哥,由于长途运输和国际旅客业务的下降,空调列车有从16,000辆减至14,000辆的下跌现象。这个数字尚会继续减少。但在纽约,芝加哥、费城和旧金山这样城市的近效空调车辆(持月票车——下同)是例外。
Passenger air-conditioned trains appeared about 30 years ago. Today in the United States, all newly built trains are equipped with air-conditioners except for some subways. In some countries, such as Canada and Mexico, air-conditioned trains have been reduced from 16,000 to 14,000 due to declines in long-haul and international passenger traffic. This figure will continue to decrease. However, near-effect air-conditioned vehicles in cities such as New York, Chicago, Philadelphia and San Francisco (monthly ticket cars - the same below) are an exception.