Longer term, Hydrail [1] (Hydrogen) might replace Diesel-electric. I guess this will start with cities, where pollution is a problem. [1] https://en.wikipedia.

Longer term, Hydrail [1] (Hydrogen) might replace Diesel-electric. I guess this will start with cities, where pollution is a problem. [1] https://en.wikipedia.org/wiki/Hydrail https://en.wikipedia.org/wiki/Hydrail