>>205906225kV AC is the future. 1500V DC is only suitable for light rail and metro systems. It needs too much current for anything with a high power draw, uses lots of copper and causes high losses. Juicing up the system to compensate becomes way more expensive than just increasing the voltage.
Even NS (Dutch rail) are looking at changing their entire network to 3kV DC to reduce their horrendous power draw and losses.
Pic related on 25kV will draw ~200 Amps per loco at full power (4.6 MW). On 1500V DC that becomes ~3,100 Amps.
