PV = Photovoltaic

  • If the tracks are used as the wires

    They’re not. Swiss rails are extra made so that you can walk over them. All electricity goes overhead for security reasons. If anything, they would probably tap into this overhead-grid.

    cleaning & maintenance

    possibly. But I can very easily imagine specialized trains cleaning them once every day

    vandalism

    not really a problem here in switzerland

    modifying the track to limit the conductive paths (assuming they’re used for this).

    They’re most likely not used for this. All electricity is overhead for security reasons, routing solar energy through the rails would destroy that. Doing that (beyond the 100m test-track) would mean a prolongued political discussion.