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对东风4A(B) 型机车和东风4D型机车作了性能比较 ,指出东风4A(B) 型机车改型升级为东风4D型机车是必要的 ,也是可行的。论述了改型后的性能提高情况和各主要设备如柴油机、主发电机、牵引电动机等的改变情况 ,还就已改型的 10台机车的运用情况作了介绍。
The performance comparison between Dongfeng 4A (B) locomotive and Dongfeng 4D locomotive is made. It is also proved that it is necessary and feasible to retrofit Dongfeng 4A (B) locomotive to Dongfeng 4D locomotive. The improved performance after modification and the changes of main equipment such as diesel engine, main generator and traction motor are discussed. The application of 10 modified locomotives is also introduced.