The power input shaft of the main speed reducer is provided with an optoelectronic pulser;
在主减速器动力输入轴上设装光电脉冲器；
Dual pipe air supply systems were also added in DF 11 locomotives as a main speed up locomotive, and the relevant renewal of this type at depots were conducted.
东风11型机车作为提速的主型机车也加装了双管供风系统，并对在段的该型机车进行了相应的改造。
Dual pipe air supply systems were also added in DF 11 locomotives as a main speed up locomotive, and the relevant renewal of this type at depots were conducted.
东风11型机车作为提速的主型机车也加装了双管供风系统，并对在段的该型机车进行了相应的改造。
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