Nope, public transportation is impractical in cities such as Chicago and Los Angeles because they are spread out over hundred of square miles. Trains are practicla only in compact cities like in Europe.
The METRA trains running into Chicago from the Western Suburbs are well used, and a lot of freight runs on these tracks as well. A five minute wait at a crossing is a familiar though intermittent occurrence, and on these occasions I curse my fate, but never the RR.
Your comment does not make sense, because Chicago has a good bus/train transportation system...see link above. AND Los Angeles has a somewhat fair system....you can look that up online.
Trains/Trams/Buses work fine in America’s cities, maybe not in the distant suburbs. Dayton, Ohio electric trollies in 1940s ...Why don’t you research that, and you will find out how America missed the real answer to pubic transportation.