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概述了国内外铁路列车外部清洗技术及设备发展状况，详细介绍了德黑兰地铁列车自动清洗机的结构原理和工作过程，研究了其中的关键技术及实现方法。
The external cleaning technology and equipment development of railway trains at home and abroad are summarized. The structure principle and work process of Tehran metro train automatic cleaning machine are introduced in detail. The key technologies and methods are also studied.