First, regarding Highway Fuel Use Taxes, any vehicle used in interstate commerce will pay Highway Use Tax to each State over which it operates. Thus it matters not where the vehicle fuels up; eacg state will get their "cut". If a vehicle fuels up in a particular state, it pays all applicable fuel taxes at the pump, but gets a credit for such (had an interstate trucking company as a client).
This is unlike "you and I in our four wheelers" where we buy gas in one state, that state "gets it all" regardless of where we roam. Back when I took road trips up to Jan '20, I always made it business to fuel up in each state through which I passed. No law saying you must do so, but "that's just me".
Now to Pete and the rails - and in particular passenger rail. As I noted over at the Amtrak Forum, what I believe will be of interest is who Joe appoints as FRA Administrator, and who in turn within the agency is Chief in the Office of Rail Policy Development. That is where Administration policy for railroads - freight and passenger - will be formulated.
I'd be much more concerned about that chain than whether or not Pete (I'm sure he will get confirmed; Reps will want to save their Howitzers for the big seats like Defense, State, Treasury, and AG) is pro rail or "otherwise".
Finally, Mayor Pete delivered a "very forthright" acceptance speech: