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通过对东风7D型机车运用中轮缘磨耗、踏面磨耗与燃油消耗的统计分析，说明了机车对小半径曲线线路的适应性与运用经济性，同时对机车运用质量问题进行了归纳，提出了改进建议。
Through the statistic analysis of wheel rim wear, tread wear and fuel consumption in the application of DF7D locomotive, the adaptability and economy of locomotive to the small radius curve line are illustrated. At the same time, the quality of locomotive application is summarized, and the improvement is proposed Suggest.