In places such as Europe, where ridership on trains are very high, it makes perfect sense to have these high speed trains in place. However, in the United States, we have a pitiful lobbying in the government where the oil and rubber industries convinced the government to invest more money in these sectors, which gave way to a rapid rise of cars and aeroplanes. We used to have trolleys and trains all over the country, but it died out of necessity. Now, cities are trying to bring back trains and trolleys as viable solution for reducing the traffic congestions on the highways and the pollution in the air. It's a very slow road ahead for us, as we need to start convincing people the virtues of public transportation. Before we do that, we need to invest in a good system that can maximise optimal ridership from point A to B, etc...
Right now, SLC only has two light rail lines, connecting the downtown to the Olympic stadium / Univ of Utah, and another one connecting downtown to Sandy. UTA needs to branch out on the routes with the light rail lines, and to also establish train services to and from cities such as Provo/Orem and Ogden. SLC is rapidly becoming overpopulated, and we need these fast.
As for the long distance train rides, I think it makes more sense to fly in aeroplanes. Especially out in the west, where the cities are very far apart, unlike the cities on the East Coast. Las Vegas is about 7 hours from here by car, Denver 9 hours, Reno 8 hours, etc... And cars already drive at an average speed of 90 to 100 mph on the highways (even though the speed limit is set at 75, but there is nothing, not even a living soul in large parts of the areas between the two cities.) So, since cars move almost as fast as these high speed trains, people would probably rather fly in aeroplanes anyhow.