I was surprised to discover a little while ago that the London Underground has had energy recovery systems in place for quite some time, based around a short incline on the route into a station, and a descent leading out of it[1]. Energy is then quite neatly stored as gravitational potential over the height difference.
The ability to retrofit this new system to existing infrastructure without major engineering works is definitely a huge plus.
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[ 5.0 ms ] story [ 10.8 ms ] threadThe ability to retrofit this new system to existing infrastructure without major engineering works is definitely a huge plus.
[1] https://en.wikipedia.org/wiki/Regenerative_brake?s#Electric_...