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北京和上海作为我国经济发展最出色的两座城市，城市之间人员的往来非常频繁，而在这些人中，除了一般的旅客外，更多的是为了商务贸易而来回奔波的商务人士。因此推出了“最舒适”的高铁：D311次列车——全国唯一双层卧铺的高铁。