I've always been an advocate of the canopies above train stations having solar panels to help power the local loads and maybe push power back to the grid.

Solar canopies are used in many other places like parking garages/lots and canals, so the technology is there.

I'm starting to wonder if it's the vibrations from the train that makes these installations risky. Those same vibrations would happen to in-track solar PV like what's shown in OP's article. It's certainly possible to design around, as the EU is showing!