That’s actually because trains can get away with batteries. Batteries aren’t a very dense energy storage and you’d never get a commercial plane to be economical with batteries. Similar to how you can have a coal ship or train, but never a commercial plane. Hydrogen is lighter than hydrocarbons by a lot, but volume wise, hydrogen takes up more space. The cryo tanks and fuel cells are heavy.
That’s actually because trains can get away with batteries. Batteries aren’t a very dense energy storage and you’d never get a commercial plane to be economical with batteries. Similar to how you can have a coal ship or train, but never a commercial plane. Hydrogen is lighter than hydrocarbons by a lot, but volume wise, hydrogen takes up more space. The cryo tanks and fuel cells are heavy.