I agree hydrogen has a lot of challenges, but as you said, it does have niche uses, and I do see some places (Steel Arc Furnace) where it could make an impact IF driven by green energy. Not really disagreeing with you persay but you are downplaying Hydrogen a bit in my opinion.
We are still finding new ways to utilize it both in the electrolyzer and in chemical synthesis so there is more ground for us to cover in the near future I feel like (opinion).
I’m not sure a train is the right place though… yeah.