electric trains are often supplied with 750V or even 30000V. Why do they use such high voltages?

Question by Max Tate: electric trains are often supplied with 750V or even 30000V. Why do they use such high voltages?
for physics hwk 😀 oh and can u plz try and answer this too?? In the US homes are supplied with 120V, but in UK, 230V, what is disadvantage with US voltage?? THANKS xDD

Best answer:

Answer by Must Know Everything
High voltage means low current for the same power. Lower current means less losses in the transmission lines. I am drunk (listening to Led Zepplin very loud) but I think I am right…..

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