Not sure. The good thing about rails vs flight is that you can swap out the energy source. As your energy production gets greener your entire travel gets greene

Not sure. The good thing about rails vs flight is that you can swap out the energy source. As your energy production gets greener your entire travel gets greener. With airlines, it is not even a remote possibility to change from kerosine based engines to electric or other green alternatives, Europe is very small and relatively dense. It would be a great way of commuting.