Yes but also that is why Airbus is researching on this.
They think tech may ready to be able to overcome those issues and are gonna try make 3 different demonstrator, one normal frame that burn hydrogen, one lifting body, and one normal frame but fuel cell propeller.
As they are one of the 2 biggest company about planes, I think they know what they can achieve

When they build that they did not have current technology.
Yes you need special infrastructure, but for a mega project like that would be the small issue.
In the end is a simple "what is cheaper to build and/or maintain", and surely there are cases where the the diesel wins, and could be replaced with hydrogen, if hydrogen cist will be low enough.
Electrification may even be better in the long run, but if the project cost much more and there are no money, a country may decide that something is better than nothing, and electrify on a later time

Not really, Remeber, the most powerful rocket are hydrogen+oxigen.
The bigger the amount you want to store, the less is the coat of the container, as container weight grow as square(perimeter), while volume contained grow as cube.
A hydrogen train make a lot of sense and they have been already successful experimented, but will never take off until cost of diesel is cheaper.