3 ms·
most subway trains are decades old - newer fleets have regenerative braking[1] But also ... almost a century of brake dust because nobody is going through and
by philjohn 2y ago
most subway trains are decades old - newer fleets have regenerative braking[1]
But also ... almost a century of brake dust because nobody is going through and vacuuming the tunnels.
[1] https://tfl.gov.uk/corporate/transparency/freedom-of-information/foi-request-detail?referenceId=FOI-3010-2223 https://tfl.gov.uk/corporate/transparency/freedom-of-informa...
- cogman10 1y agoInteresting. Looks like it the line isn't able to take the energy (I'm guessing voltage is already too high) they dump the energy into a resistive heater. Makes sense, it's just going to be heat anyways. I wonder how often that happens vs the energy getting dumped into the line.