I don't see this catching on for links between cities.
A more realistic comparison is something like Villach in Austria to Edirne in Turkey, which is 1400km by road, and €259 one-way for a car plus €149 for one person (https://www.seat61.com/motorail-trains.htm).
(Though for a journey this long people with multiple cars would probably be taking the larger one.)
The train costs more, but means families can play with their children (around a table) rather than having them stuck in the back seats for hours, and probably part or all of the journey is overnight.
Driving 100km on a nauseating mountain serpentine can easily take 2-3x longer.
But yeah, 300 dollars in Turkey is a lot of money that most people will be willing to save.
I’ve driven 680 km each way on interstates to my in-laws’ home. There on Friday, back on Sunday. Had to drive because I was bringing gifts, way too much for air travel.
And to most Americans, that’s not a particularly long drive. It’s all a matter of what you’re used to. I’ve done 4800 km in eight days and didn’t do anything but local driving on three of those days. That’s a bit more than Madrid to Berlin and back. It’s a lot of driving, but it’s definitely doable even if you’re not twenty years old.
In my own little world, I don't worry too much about 1400km in one day. I'll probably stop and take a long break at some point (and maybe catch a nap), but I don't think I'd be willing to pay $300 to avoid the drive.
It's a long day of driving, but I enjoy the diversions on trips like that. There's a whole world of stuff between A and B and it's nice to be able to stop and take some of it in whenever I feel like it when driving alone, which I can't do with a train that has my car loaded on it. (My solo driving style suits me very well.)
Or: With passengers, we can take turns driving and the cost per-head decreases instead of increasing.
Also a lot of the cost is load/unload time.
I am skeptical about the ease of scaling this, especially given the state of non-car distance travel on Amtrak.
Train: Auto-Train costs $280 per head, flat, for minimal accommodations. (Transporting the car itself is... free? I guess?)
Driving: The IRS mileage rate is $0.67 per mile (which is supposed to cover fuel and other easy-to-spot consumables, as well as purchase price and insurance and depreciation and and and), and the distance is 811 road miles between those same two points that the Auto-Train covers, or about $527.
Based on these assumptions,
For one person, the train looks cheaper. It is $280 to take the train, vs $527 to drive.
For 2 people, it's very close the same price: It is $280 per head to take the train, vs $264 per head to drive.
For 3 people, driving pretty clearly takes the financial win: It is $280 per head to take the train, vs $176 per head to drive.
The background noise should be much less than a plane, and the air pressure etc is obviously normal, but the erratic noise can be more -- e.g. some clunks if the train stops.
That IRS rate is incredibly high. It's probably around $150 or so in fuel depending on prices and efficiency to make that trip. I can't see food, insurance, and depreciation adding another $300. The ability to not drive is what can make it worthwhile for some, as you note.
These things come hand in hand, if you want to make it work things either need to be walking distance from the station or with reasonably frequent buses. If a bus comes once an hour (actually the case in my city off rush-hour) it may as well not exist.
raze = tear down
That’s the public infrastructure equivalent of technical debt.
A better solution imho is to create a plan for building train capacity where it makes sense (high traffic areas where trips are such and such - Boston-NYC-Philly-DC) and fund them through public-private contracts.
Seems like an optimal solution in some respects, if optimized. For example, millions of Canadians travel to Florida each year for the winter, a lot by car. If such a train ran once a day, it would help many with range anxiety for such cases.
But imagine if major cities had such trains between them daily? These can still carry commuters without cars, too! And of course, we don't need everyone to be covered by this solution today, because the goal is to keep the transition to electric happening. This would help.