> For trains, it's not a good idea because you can more easily supply power with overhead wire and you don't even need to deal with batteries. Rail networks wi

> For trains, it's not a good idea because you can more easily supply power with overhead wire and you don't even need to deal with batteries. Rail networks with large stretches of non-electrified lines are extremely costly to upgrade, so battery-electric and hydrogen are the likely solutions unless there is massive investment in electrification. The US, Canada, Mexico, Brazil, Argentina and Australia are prime examples of this. Currently CPKC is working on a number of HFC locomotives that are showing very promising results.