3 ms·
In the UK, 3rd rail is typically 600V (DC), where as overhead is 25kV (AC). So you need 40× the current to get the same power. For high powered intercity trains
by rjmunro 3y ago
In the UK, 3rd rail is typically 600V (DC), where as overhead is 25kV (AC). So you need 40× the current to get the same power. For high powered intercity trains that run at around 1MW of power, it increases transmission losses substantially.