The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951. [2] It was powered by a 1,200 horsepower (895 kW)12-567A engine. [1] The SW7 replaced the earlier 1,000 horsepower NW2 switcher in EMD's catalog. [3] A total of 489 SW7 locomotives were produced.

2022年6月6日 · 图纸中常见到SW，它表示 Side Width，即对边宽度，有些国外图纸中会标注成WAF，各国标准对比如下：

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2024年1月15日 · The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951. It was powered by a V12 567A engine developing 1,200 horsepower (895 kW). 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio.

六角材料的SW7就是对边为7的六方体.

机械制图里边SW后面的数字表示什么意思是公差带，也就是说加工出来的尺寸应该在一个范围内，即最小不能低于36+0.1，最大不能超过36+0.3，也就是加工完的尺寸在36.1~36.3之间为合格，低于或超出为超差，不合格！ “SW.

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