Are you people in favor of expanded rail travel in the US paid for by the government ready for the following then? Euro/Asia rail all have one thing in common, mostly dedicated passenger tracks. These in the US would have to be built, and what routes are appropriate, what are sustainable?
1. Major Tax increases
2. Eminent Domain land seizures
3. Alternate routing when issues arise, flood, storms, earthquakes, etc
4. Track routing going right next to your house
5. Politics dictating when and where stations are built which may not suit your needs
6. The massive environmental studies, costs, and delays for executing these projects
Trains may be appropriate or feasible for some long distance routes, but for most, air and vehicle travel will be more flexible.
While you can look at what others are doing, solutions which fit them may not fit us. While some say roads are subsidized, the usage as a percentage of the population is 100%, we all get benefit directly either by our personal vehicles or goods and services moved over those roads. For Freight trains it's the same, however that cannot be said for passenger rail. Then to airlines, the subsidies are their, but so are the taxes paid by the direct users and again air travel serves a much larger percentage of the public than rail ever could. Air travel is infinitely more flexible as routes are not set.
That is all part of the discussion about what rail system we need (or don't need) and there is always a cost to things, why would passenger rail be any different than anything else? When Eisenhower proposed the interstate highway system, a lot of people said the same thing about it that some are saying about trains, that those highways "are the domain of the states", "Will benefit a small group of people", "are a government boondoggle" and the like...to get that through Congress, Eisenhower said it was needed for civil defense, for evacuating cities in case of attack, allow the military to move missiles and manpower, etc (which, by the way, was a total fraud, Eisenhower was no dummy, he knew that in the event of something like a nuclear war the interstate highways would likely become jammed and useless)....and obviously that system paid off, people in areas who complained "it wasn't for them' discovered it brought benefits to a lot of people in their area and elsewhere, rural people found it allowed them to ship and get shipped to, people could visit more populated places easier, etc.
And yes, issues like right of way (though in theory abandoned right of way could be used in many places, in others there may be other ways to place new train tracks without being disruptive), can be a political football. But guess what, so is new road construction, people whose houses are on the highway complain any time they (inevitably) widen them, complain about 24/7 road noise (so they spent billions putting up noise barriers).
Political fighting? Goes on today with Amtrak, all these low volume rural stations still being serviced by Amtrak, that are money drains, so that wouldn't be anything new (and the congressmen protecting these areas often are the loudest voices complaining about Amtrak spending).
Roads are not as flexible as you think, nor are they particularly scalable. The problem with roads is that while they may have long stretches of road that are relatively lightly travelled, for long distance travel they run into bottlenecks through more developed areas. With roads, one of the things that was discovered a long time ago (and ignored) is that when you widen existing roads, it tends to create new traffic jams because people who otherwise wouldn't use them figure it is gonna be great...and inevitably, when they widen highways near me, within a year or two people are complaining the highways are packed again (talk to anyone in sunbelt cities about traffic and expansion programs, my son lives in Houston, enough said). The thing is that roads are fixed routes and to make them 'flexible' we end up pouring a lot of money into them....and they are subsidized because often regions expanding their highway system relay heavily on funds created elsewhere, there is no free lunch despite what it seems to some, so the same thing applies with roads that applies with cars.
Plane travel? Not as flexible as you claim, I don't know how you can claim that routes aren't set, of course they are. They don't let commercial airlines fly anywhere they want, there are air corridors analagous to roads, and approach paths to airports are very rigidly set (partially due to wind conditions, they can change, but they are established). You don't just suddenly decide to fly a 757 to some regional airport, airlines have to apply for those routes because a)the gate access at airports is limited, and quite coveted b)airports can only land/takeoff a certain number of planes c)air traffic control (which is quite expensive I might add) has to approve because their capacity is limited. Many flight corridors are already quite saturated, so the idea that planes are flexible is basically not true. Not to mention that airlines in many cases no longer are point to point, they use hub and spokes, so if you want to get from A to D you need to pass through B and C as well.
Expand airports? Good luck, you have to go through the same environmental battles, the same NIMBY people around airports have, the cost of expanding the aiports (that are all government run in the US, they are run either by state/local governments or regional authorities like a port authority) , so taxes can be involved, or bonding to pay for capital improvements that in turn comes down to taxes paid on tickets sold or often things like excise taxes that are hidden.
Subsidies? One of the reasons the personal car and airlines (and yes, railroads to a more than large extent) work is the cost of the fuel they use. The reason it is cheap in the US is because in part it is subsidized, through a variety of measures (and yes, this would apply to passenger railroads as well, given they use diesel oil or power generated from mostly fossil fuels).
My point isn't that cars are bad, air travel is bad, buses are bad and trains are good, my point is that if we are going to argue about whether trains make sense we need to figure out a) where they make sense (mostly on highly travelled corridors, though other economic benefits come to mind) b) quantify the cost of implementing it , comparing that cost to alternatives (cars, airplanes) if we had to expand to allow them, then looking at the benefits (for example, take a high speed train on a heavily travelled air corridor, reduce load on the air traffic control center/more people moved, for travellers going city to city saving traffic on roads to/from the airport, load on tsa, etc). The problem with talking about anything is quantifying things in the same terms, and that is part of the problem of these discussions, people don't. They talk about the 'freedom of the airplane', 'the freedom of the car', how that is 'determined by the market, not the government', they talk about the cost of trains without quantifying the cost of other forms of transportation, the negative and positive impact (for example, with mass transit, clogged roads for commuters mean lost time for businesses, and also a big cost to them in terms of job satisfaction and quality of life, with mass transit that experience is likely to be better even for people who continue to drive). As far as poor political decisions, I can name a ton of them with roads and airplane travel, too, airports expanded that end up ghost towns, roads built (it seems) strictly to bring jobs to an area (there was a feeder in Pennsylvania that was a lulu, had to blast through a mountain full of a toxic, corrosive substance), so that argument applies to everything involving government/semi government activities, it isn't unique to trains.
The biggest obstacle is the myth that 'the market decides', with transportation it doesn't, the winners and losers are often decided by policies and subsidies and political decisions few if any know about (wanna know why they don't have high speed train service between NYC and the airports in the region? During the post war boom in air travel, when the airports were being expanded, service increased, Robert Moses and the concrete heads were basically in charge of most projects, and hated mass transit).