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为防止由于物体对机车、客车和守车车窗玻璃的冲击而造成铁路雇员或旅客的伤亡，美国联邦铁路管理署作了一系列规定，其中包括机车、客车和守车须装配经认证的车窗玻璃，对未装配经认证的车窗玻璃者采取处罚措施，车窗玻璃材料的认证试验要求以及标记要求等。美国联邦铁路管理
In order to prevent the casualties of railway employees or passengers caused by the impact of objects on locomotives, buses and window guards, the United States Federal Railroad Administration made a series of provisions including locomotives, buses and vans to be fitted with certified vehicles Windowpane, penalties for unassembled certified windowpane, certification test requirements for windowpane materials, marking requirements, etc. United States Federal Railway Administration