Caltrain announced that regenerative braking on the new trains is generating and sending back to the electric grid approximately 23% of the energy consumed by the system

[jacobcoffinwrites@slrpnk.net]

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[wewbull@feddit.uk]

I'm surprised it's as little as that. My understanding of trains is that the rolling resistance is very low and that all the energy is really for accelerating from standstill. That would be recovered during braking (mostly).

[copd@lemmy.world]

Cabin climate and lighting, especially in warmer contries must be a good 10-20% of energy usage. But yeah a lot of energy is wasted into heat, the London underground is a perfect case study on it

[treczoks@lemmy.world]

I'm amazed that they only learn about this now. Using regenerative braking on trains was something we got taught about in school, and that's nearly 40 years ago.

[daughter3546@lemmy.world]

I am now genuinely curious about the challenges of insulating things underground. Do you know a good article or a study that I can read?

[bigdiction@lemmy.world]

Until fall 2024 Caltrain ran on diesel engines. It just electrified so I don’t think returning energy was feasible for the line until just recently.

[rubberduck@lemmy.world]

https://youtu.be/Y8RfeAmLfn8?si=TtPisNI8ZMjoPBMZ

[ericjmorey@lemmy.world]

How would they learn that the newly installed system is more efficient than predicted before now?