In order to create H2, you need water and lots of electrical DC current in order to strip the oxygen off. Generally the process uses an electrolyte like KOH and water. You pass huge amounts of electricity and you get "clean" energy.
Of course, don't look too far upstream to see how your electricity is generated. It starts looking ugly and less green.
I wonder if they could harness the mechanical energy of the train wheels as an induction generator to create electricity (kinda like a water wheel in the old mills). That way the train could generate it's own electricity to use to break down water into it's constituent parts.
No doubt, there are all kinds of schemes to get energy. The point I'm making is that green energy is a farce.
Looking at a steam engine, one could argue it's green because it only generates steam (water) into the air. Except, inconveniently, there's a big smoke stack billowing out black smoke as it needs to use a combustible material, like wood, to generate the steam.
What people will do is come up with a way to hide the ugly smoke stack. Usually, the trick is to move it away from sight. With a steam engine, you could pressurize a gas in a bottle and attach that to the steam engine. The consumer would no longer see black smoke. The engine would appear to run with no visible exhaust. It's now green!
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