Unless you make the trains go 900km/h, you are talking about very different things. “I need to rent a car at the end of this train journey, which itself is about the speed of a car” is dumb — just rent the car, don’t waste money buying a train ticket as well, and travel on your own terms. So the only thing it offers is being cheaper than renting a car for one extra day for long journeys.
I really wanted to take a train or greyhound, wasn't super picky, for my last two trips but it was stupid. I had naively assumed the tradeoff was going to be adding about two days to the trip for travel there and back but in exchange it would be a lot cheaper than a flight. Nope. I guess. For some reason. Same travel days, same destinations. Not only were flights, obviously, faster but they were cheaper too.
Pay more for fewer departure/arrival options and turn a few hour hours into +1 day on each end seemed not worth the vibe.
> So the only thing it offers is being cheaper than renting a car for one extra day for long journeys
Nope. It also offers not having to drive. I can read a book on a train, which I can't do in a small car even if I don't drive because I'll get car sick. I can even walk around and have luch in the train restaurant, go to the bathroom without having to stop.
