Interesting. 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.
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-informa...