Amtrak currently runs trains on the freight tracks, but as Amtrak essentially leases the privilege of using the tracks at all from CSX and BNSF and Union Pacific and the like, their traffic gets heavily deprioritized to freight trains. You can totally catch a train from Fort Worth to Los Angeles, but it will take a few days longer than driving, will be almost as expensive as flying, and the train will be delayed many times for freight traffic.

If the federal government nationalized the rails, put them under the care of the FRA, properly funded Amtrak, and gave it a healthy advertising budget to let people know rail is the clear choice for medium length trips (like Chicago to St. Louis), there’s no reason we couldn’t send passengers on the same rails and with the same priority as freight trains. They’re perfectly safe, and the reason we’ve been hearing about so many train wrecks lately is the degradation of work conditions for rail workers. Longer trains and longer hours make for more dangerous operating conditions and more frequent wrecks.

And while the trains wouldn’t run 190 miles an hour, many long, straight stretches do exist, and it’s not unheard of for a train to be running 80-100 miles an hour on those stretches. That kind of speed is very doable for passenger rail. Hell, some Amtrak trains are capable of 150 miles an hour.

My point wasn’t to use 150 year old rails. It’s that the rails already exist so it doesn’t need to be a decades-long multi-trillion dollar project. It’s highly unlikely that any of the rails in use today are from the 19th century.