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铁道科学院研制生产的 DTHQ—1型电子恒功调节器在北京二七机车工厂生产的东风_7型调车内燃机车上装用。从1987年10月我段配属第一台东风_7 型内燃机车以来,陆续配属了20
Railway Academy of Sciences developed and produced DTHQ-1 electronic constant power regulator produced in Beijing Erqi locomotive factory Dongfeng _7 shunting diesel locomotive used. From October 1987 I paragraph is assigned to the first DF_7 diesel locomotive, one after another belong to the 20