Among the four electrical power system mentioned before, the most economical and reasonable one is the overhead contact voltage power supply which is supplied by the overhead contact directly.

在所设置的四种供电系统中，由接触网电压直接供电的网压电源是最经济、最合理的供电系统。

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The overhead catenary system is the main facility for power supply in electrified railway.

接触网是电气化铁路的主要供电设备。

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The firm said it continuously monitors track, signalling, overhead power supply and other equipment for ageing and degradation.

BBC: England

In electric trains, the braking energy is converted into electricity and fed back into the overhead power supply.

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