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Trains in Switzerland Are Now Running Over Solar Panels in a First-of-Its-Kind Test
(www.zmescience.com)
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Solar is DC. Converting it to 16hz probably isn't more difficult than converting it to 50hz.
Yeah the frequency is not the issue, the high voltage could make it expensive to transform the power up in a distributed manner along the tracks. Might be better to run a separate lower voltage line to the next substation.