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Hydrogen or battery?
The answer is battery. If battery is an option then the answer is battery. Always.
This will only change if either there is an unlimited amount of free energy available or the laws of thermodynamics stop being valid.
None. Just build more transit.
Or overhead wires if it makes sense economically due to high volumes of trains.
Catenaries are cool, use them.
Neither firi trains.
We solved this a loooong time ago, put some wires up ffs.
