They will need dual voltage sets if they are thinking of electrifying the line with the new standard of 25kv. All of Melbourne metropolitan area is 15Kv. I believe that the regional rail line is mostly segregated. So they could get away with 25kv compliant sets and seperate stabling up near Geelong? Otherwise dual voltage sets shared with the Airport line?
Not clear what advantage there would be in going to 25Kv AC when the rest of the electric network is 1500v DC. They aren't going to be stringing up wires to Ballarat or Bendigo any time soon, there isn't enough traffic to justify it.
I guess 25kv would be advantageous for future extensions past Geelong towards the Great Ocean road (Torguay) and up to Allarat Westbound towards Adelaide.
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