东风4型机车的ZQDR-410型牵引电动机引出线Cz、Hz的折断始终是主回路的主要质量问题之一，虽经各方面努力攻关，其中包括在全路推广的由原来的硬结构改进为软结构等，都没有得到理想的解决，严重困扰了各机务段牵引电动机的运用和检修。针对这一问题，锦州机务段研制出了防机械性折断的叠板式引出线（以下简称叠式引线），经过装车使用，取得了很好的效果。 Dongfeng 4 locomotive ZQDR-410 traction motor lead Cz, Hz break is always one of the main quality problems of the main circuit, despite all efforts to tackle key problems, including the promotion of the entire road from the original hard structure to Soft structure, etc., have not been the ideal solution, seriously harassed the locomotive depot traction motor operation and maintenance. In response to this problem, Jinzhou Locomotive Depot developed a mechanical anti-mechanical folding stack of leads (hereinafter referred to as stacked lead), after loading and use, and achieved good results.