It is simple process, less pollution, low cost, good quality casting, and can meet producing of locomotive casting, that the investment pattern was made from the shell mold was made from silica sol.

采用硅溶胶粘结剂制造型壳，工艺简单，污染少，成本低，铸件质量好，满足机车类精铸件生产要求。

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The system is controlled by digital circuits and a simple passive sensor to be used on the ground. The control circuit for the locomotive doesn't need much to be modified.

该装置采用数字电路控制，地面传感器为简单的无源传感器，机车控制电路改动甚少。

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ZK3-6/250 single stage drive electrical locomotive adopts step speed adjustment with the characteristics of easy operation, simple structure, reliable running and easy maintenance etc.

ZK3-6/250单级传动电机车采用有级调速，其特点为操作简单方便、结构简单、运行可靠、维护方便等。

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