新中国成立后，在北京的长辛店、山东的四方机车厂开始生产自己的蒸汽机车。
B-Organization I-Organization I-Organization B-Time I-Time I-Time O O B-Location I-Location O B-Organization I-Organization I-Organization O B-Location I-Location I-Location B-Organization I-Organization I-Organization I-Organization I-Organization O O O O B-Organization I-Organization O B-Thing I-Thing I-Thing I-Thing O