I think the most important change is to revert taxation to the way it was for thousands of years up until about 100 years ago.
It used to be that all taxes were wealth taxes. A guy would come around, eyeball all of your stuff, guess how much it was worth, and then demand a cut of it for the emperor/pharaoh/ceasar/etc. If you didn't have anything valuable, the guy would more or less leave you alone.
That's not how it works now. The main forms of taxation are on income and spending, with tax codes carefully written to avoid any "non-income" forms of revenue. There are very low capital gains taxes on stock dividends, zero on most home equity gains, and loads of ways to avoid those if you're even remotely savvy. Basically, it's specifically structured to extract wealth from the working and preserve the wealth of the rich. Personally, I paid nearly twenty thousand dollars in income tax alone while the richest guys in Canada paid practically nothing.
We need to go back to a wealth tax, which worked for 99% of human civilization. It's easier than ever, considering that every financial institution and government knows your exact net worth down to a few %. The burden needs to be taken off of the working class, and this is the easiest way to do it. No revolution, no eating of the rich -- just some rich guys kicking in their fair share.
Of course, we all know it's not going to happen -- the wealthy are far too powerful to threaten their own interests. Until then, we work the fields I guess.
This is not as good of an idea as you may think.
First is where the hydrogen comes from. Most commercially available hydrogen comes from fossil fuels. The most common process involves superheated steam, methane (aka natural gas), and a catalyst. Very little hydrogen comes from renewable energy via hydrolysis.
Second is efficiency. The total process of transforming renewable energy to hydrogen, storing and transporting the gas, then using it to move a locomotive is only about 30% efficient. There are significant losses at every stage, and it’s a very complex supply chain.
Now, compare this to very boring overhead electrified railroads, which have existed for over one hundred years. Modern systems can achieve nearly 85% efficiency from generation to locomotion, are cheap and easy to build, and have some of the most reliable rolling stock around since they’re essentially a really big slot car. The only downside is the big up-front investment in overhead lines, but that quickly pays for itself with the overall efficiency of the railroad system.
If you ask me, this is a bad idea. It’s somewhere between well intentioned but poorly thought through engineering, and the good old fashioned greenwashing of the fossil fuel industry.