为了提升效益，铁路货运需要开行双层集装箱列车，而上跨铁路立交桥桥下净空不足。
For greater benefit, the railway freight requires operation of double-decked container trains, making the clearance under the railway overpass insufficient.
2010年，一辆双层巴士在纽约上州撞上铁路立交桥，上层乘客有4人死亡。
In 2010, a double-decker Megabus crashed into a railroad overpass in upstate New York, killing four on the top deck.
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