I've seen this before. Last time I looked, it required that everyone live in cities with good public transportation. It also didn't factor in modern necessities like air conditioning (which will be actually necessary in many more parts of the world due to global warming).
Basically, for this to work, everyone needs to live in 2-bedroom apartments... Without air conditioning or anything like a desktop PC. You'd have a small refrigerator and heat your food with a microwave (and nothing else because stovetop and ovens use up too much energy).
It also makes huge assumptions about the availability of food, where it can be grown, and that all the necessary nutrients/fertilizer are already present in the soil and that transporting/processing things like grain is super short distance/cheap.
Also, communism. It requires functioning communism. That everyone will be ok with it and there will be no wars over resources/land.
Yeah! Go for it!
I'm curious to see how you'll haul away 19,600 gallons of corn syrup, 3,900 bushels of grain, 100 tons of random auto parts, 80 tons of paper reams, 70 tons of logs, 13,000 gallons of ammonia (or other dangerous chemicals), and the various other things that typically get shipped via rail these days.
You might get lucky and find a boxcar full of canned goods 👍
...or maybe even actual cars but... How would you get them off the train without the necessary equipment/track setup? 🤔