地处中原的郑州机务南段，一九七三年开始使用内燃机车，其主要机型为东风_3型，它担当着郑州往南至信阳、武昌，郑州往北至安阳，郑州往东至商丘、蚌埠，郑州往西至三门峡西四个主要区段的客运任务，还曾跑郑州至月山、长治北，其运输任务之大是全国数得着的机务段，再加上京广、陇海两大干线机车运行速度高、坡道大、弯道多，因此对机车制动系统提出了严格的要求。为了保证行车安全，既要机车制动机质量高性能好，又要十分准确 Located in the Central Plains Zhengzhou, the southern section of machinery, diesel locomotive began to use in 1973, the main model for the Dongfeng _3 type, which acts as a Zhengzhou south to Xinyang, Wuchang, Zhengzhou, north to Anyang, Zhengzhou to the east Shangqiu, Bengbu, Zhengzhou west of Sanmenxia West four main sections of the passenger task, also had to Zhengzhou to the mountains, Changzhi North, the transport task of the country is worth a few of the locomotive depot, plus the Beijing-Guangzhou, Longhai Two main lines of locomotive running speed, ramp, corner more, so the locomotive braking system made strict requirements. In order to ensure traffic safety, it is necessary to high quality locomotive brake performance, but also very accurate