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大连机车车辆工厂生产的东风_4B型干线内燃机车,于1986年10月17日在铁道部东风_4 B型机车鉴定会上通过了部级鉴定。鉴定意见认为:东风_4B型机车的牵引、热工、动力学和空气制动等性能及技术经济指标等,均已达到了设计任务书的有关规定,其主要技术经济指标具有国内先进水平,在经济性、动力学性能等方面接近国外先进国家同类产品的水平。东风_4 B型机车是在东风_4 A型机车基础上发展起来的改进型新产品,是目前我国铁路干线
Dongfeng _4B diesel locomotive produced by Dalian Locomotive and Rolling Stock Plant passed the ministry appraisal on October 17, 1986 at the appraisal meeting of Dongfeng _4 B locomotive of the Ministry of Railways. According to the appraisal opinion, the performance, technical and economic indexes of Dongfeng-4B locomotive traction, thermal engineering, dynamics and air braking, etc. have reached the relevant provisions of the design task book, the main technical and economic indicators of the locomotive have the advanced domestic level, In the economic, dynamic performance and other aspects of similar products in advanced foreign countries close to the level. Dongfeng _4 B locomotive is an improved new product developed on the basis of Dongfeng _4 A locomotive, which is currently the main railway line in China