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Electrification is around $1,000,000/mile these days - DC or AC - doesn't matter. In urban territories it might be more expensive - likewise with long tunnels. <br /> <br />Locomotives last longer since there is no big infernal combustion engine on board - so much less vibration, wear and tear. 50yr life spans are not unheard of with 60+ in certain examples. But that was for straight electrics. How long wil current generation of thyristor-solid-state-rectifer locos last is a mystery. <br /> <br />However - american style 200 ton loco, properely overbuilt :P with good quality materials would be pretty much eternal with proper maintenence.
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