No, it really doesn't sound like that.
Trains, and other public transport vehicles, in comparison to the damage that individual traffic does, ARE a contributing solution to global warming.
> Scaling up packing as many people as possible into cities is not a desirable goal to significant chunks of people.
Oh really? Then how did cities come to be in the first place?
But you know what really makes cities a hell to live in? Covering them with multi-lane roads and giant parking lots for those flotillas of pointless metal boxes with rubber wheels.
Because it was and is the only way to escape poverty for many people.
I grew up in a small city and the majority of my classmates had to go to larger city to get a good job.
This effect was very extreme during the early 1900s especially when the Great Depression hit. Either starve on the farm or move to filthy city. Cities being desirable for anyone but the rich is a very recent phenomenon.
> This is how actual people in actual cities live, today. Many european and asian cities are completely accessible by public transport.
And many people hate it too. Look at the popularity of cabs/ubers/limos in those cities.
Scaling up packing as many people as possible into cities is not a desirable goal to significant chunks of people.