>>1985415>>1985443>>1985449Been doing some reading and energy losses are proportional to the current2.
So raising the voltage results in a much lower current loss and a need for fewer substations and thinner wires for equivalent power transmission.
Hence newer schemes tend to use higher voltages.
Though that doesn't explain the use of 750 DC as a standard for trams
>>19854432x25kV AC might be better to avoid
>>1985482.
It basically transmits at 50kV by using opposing phases at 25kV between the catenary and transmission lines.
But the circuit between catenary, train and track is only at 25kV.
