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   Glyn Moody (glynmoody@mastodon.social)'s status on Thursday, 23-Jan-2025 20:53:12 JST Glyn Moody

   How #Barcelona's Metro trains generate electricity - https://mashable.com/video/barcelona-metro-regenerative-breaking-ev "thanks to a system called regenerative braking" #sensible

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     Knud Jahnke (knud@mastodon.social)'s status on Thursday, 23-Jan-2025 21:52:48 JST Knud Jahnke

     in reply to

     @glynmoody

     You are aware that this energy was put into those trains before, by powering their motors, right? And that they simply put back the energy into the grid, so this has nothing to do with the station or anything specific around the station.

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     Glyn Moody (glynmoody@mastodon.social)'s status on Thursday, 23-Jan-2025 22:22:16 JST Glyn Moody

     in reply to

     • Knud Jahnke

     @knud obviously

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     The Penguin of Evil (etchedpixels@mastodon.social)'s status on Thursday, 23-Jan-2025 22:34:14 JST The Penguin of Evil

     in reply to

     @glynmoody We've been doing this for a very very long time indeed. Very old technology. The exciting bit is what happens when your regenerative braking is generating vast amounts of power and you briefly lose contact with the wires.

     Some bits of the underground also have gravity based braking from before even this - there is a rise into station platforms and a fall the other end so that some of the kinetic energy is captured in the rise in height and then turned back the other way as you leave

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     Glyn Moody (glynmoody@mastodon.social)'s status on Thursday, 23-Jan-2025 22:36:54 JST Glyn Moody

     in reply to

     • The Penguin of Evil

     @etchedpixels thanks for the info