For reasons of physical and thread work. Power system with three tracks. Train for a power station powered near each other on the way and the speed is not high. (Power consumption is not very high), such as electric trams in the city, such as the BTS, MRT, etc. The system charts electricity locally stored on the car. It aims to add beauty to the landscape of the city because no electrical wiring clutter by rail. Most take the tram.
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