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A comment on Battery-electric “Infinity Train” will charge itself using gravity (2022). Parent comment

Re:Battery-electric “Infinity Train” will charge itself usin... by blacksmith_tb on Monday July 31, 2023 @10:10PM (#36951509)
The light rail MAX trains in Portland use regen braking without batteries, as one train is slowing it's generating power for other trains that are in motion[1].

1: https://www.wired.com/2013/06/portland-light-rail/

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