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   Garry Keenor (25kv@mas.to)'s status on Monday, 22-Jan-2024 02:07:22 JST Garry Keenor

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   So the very earliest electric railways used DC overhead line or third rail. This kept the the on-vehicle equipment simple and reliable. Rectification was done back at the substation, since all electrical power is generated as AC.

   So why aren’t all electrified railways DC? Because AC supply has several significant advantages over DC.