本文阐述了新制SS4型八轴货运电力机车样车的电气线路。
The article expounds the electric circuit of the prototype of SS4 locomotive of 8-axle for freight traffic.
全路客运客车和货运客车大多采用电力机车牵引。
The electric locomotive traction is mostly used in the whole railway passenger carriages and freight passenger carriages.
截至2015年年底，铁路主要干线全部实现内燃、电力机车牵引，客货运输车辆品种和结构均实现升级换代。
By the end of 2015, all railway trunk lines had realized diesel and electric locomotive traction; types and structures of passenger and freight transport vehicles had been upgraded and updated.
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