How would this work in a city like Houston?
The main problem with Houston (Texas in General) is that people do not want to give up their SUVs and Trucks. But most of them folks on 288 ain't headed to the Ranch or Oilfield.
Start with something like this
And even with a train system, there would need to be transportation options at the stations.
They'd have to tear down a lot of the freeways and "stroads"
Let's not even start with how much that one part of 610 floods with just moderate rain.
Assuming they could get the infrastructure right - then you'd start to see the private sector create a lot of "infill" development. So anything by a train stop, light rail, commuter rail would jump up in price. All that really does is push even more Black folks out of the neighborhoods they live in.
With that said, a lot of the places they gentrified now aren't "walkable" like a DC, Philly, NYC, Boston. (Honestly the places that are truly walkable on the East Coast tend to be high dollar.) NYC has 7 times the density that Houston has - and that's really what you would need for it to make sense. Houston is 2.2M/The metro is 8M - so 15-56M people.
This would be a very long term project, like 50-60 years, and it's not clear if Houston/The South/The Southwest is going to be economically viable with climate change already popping.