Some of the trains in the photograph use up to ~17MWs, to get 129MWh of batteries installed on the ground in the worlds largest battery array at the time, cost $90 million dollars and while a train could certainly pull it, it's a non-trivial addition. That battery array couldn't move the train for even a fraction of some journeys required by train engines, so I think it's a non-starter economically for these cross-country journeys.