[xg15]

I guess it's one of the usual numbers games in everything related to climate.

"Each day, our trains pull x MWh of energy from the grid and we're paying renewable energy providers for y >= x MWh - therefore we can say our trains run on 100% renewable power."

Whether or not some of the electron domino that finds its end in a train's motor coils happen to have started in a coal plant doesn't matter for this calculation.

You can like this or not, but I guess there aren't a lot of better options as long as renewable and fossil power sources are both supplying the same grid and energy is effectively fungible.