Furry Technologists

Also, most hydrogen is made from fossil fuels because it's super inefficient to convert renewables to hydrogen.

From a technological point, yes. That being said, there are some complications. The US runs double-stacked intermodal freight so clearance is a concern, first of all. It's doable, in fact India has many electrified lines that allow for double-stacked intermodal freight, but it does add a little to the cost and effort. The second issue is, unfortunately, cost, but not because it's outright "too expensive". Rather, it would eat too much into the short-term quarterlies of the various publicly traded rail companies that own a vast majority of the US's rail lines during the installation. And as publicly traded companies, even if one of the major rail companies wanted to spend the money to electrify, they would get sued by their shareholders for doing so because there's no immediate return on profits. And the final issue? NIMBYs already hate rail as-is, they'd hate the overhead lines even more.

So, yeah, a lot of challenges to electrification unique to the US, almost all of them political in nature. It would be really nice to put in electrified rail again (late PRR and New Haven were almost fully electrified but most of that was ripped out after the Penn Central merger. Seriously, everyone likes to rag on New Haven for screwing that up but honestly the evidence all points to the New York Central's management team being the real culprits).