To respond to some posts above, asking where private-sector dollars could be used:
1. Real estate: Amtrak already has partnered with private developers around 30th Street Station and Washington Union Station. Surely there is other real estate that could be redeveloped or otherwise commercialized with a private-sector developer. Perhaps this has already been fully explored; I don't know.
2. Fleet acquisition: could a private buyer buy new railcars for Amtrak and lease them to Amtrak? This has been done before (I believe).
3. Contracting out entire routes: legislation has provided for this, but to what extent has Amtrak aggressively pursued private operators? For example, if it costs Amtrak $10 million to run a route for a year, could Amtrak find a private operator who Amtrak could pay $9.5 million to take it over, saving Amtrak money? I may be wrong, but I understand that Amtrak has resisted contracting out its routes--but is that the best practice from a dollars-and-cents perspective?
4. Contracting out certain on-board services: if private railroads farmed out their sleeping and lounge cars to Pullman, has Amtrak looked at doing that? I know that Iowa Pacific has attached cars to Amtrak trains; that failed, but is it worth aggressively seeking partners to do that nationwide?
5. Contracting out infrastructure improvements: some highways are built or financed by private developers, which are repaid as the highways are used. Has Amtrak looked at having private partners fund track improvements, with Amtrak to pay them back over time as trains are run?
6. Total route re-dos: given how Brightline improved track and introduced new train services, linked to real estate development, why hasn't Amtrak done that?
All of these may have been looked at, and there may be other examples. So perhaps these are all stupid ideas, but given the range of private-sector participants who are taking part in passenger rail projects around the US, UK and EU, I'd think that there would be at least some things that Amtrak could do, but hasn't, to attract private capital IN ADDITION to financial support from government, which could lead to more and better service.