My knowledge of "popular" underground (London) or metro (Paris) lines makes that very unlikely, they're hot, way overcrowded, and odd-smelling when they don't outright stink.
Very useful and convenient, and can be pleasant outside of peak hours, but back when I worked in Paris despite not being a morning person I switched my work hours to take the metro way off-peak (between 6 and 7) so I could commute with some fresh air and have more than "no room whatsoever".
On the most populated lines, the trains are packed line sardine cans, and I don't know now but 20 years back there was no AC let alone AC which could handle a car packed to the brim in high summer.
Just to be clear: I didn't regret not having a car one bit, and given my commute was directly through Paris (from one near suburb to an other on the opposite side of the city) I don't think commuting by car would have been more pleasant. Couldn't have commuted reading books for starters, that's an advantage of a somewhat lengthy train commute (bus is less comfortable for reading especially if you tend to get car sickness, and obviously you can't read in your car though I guess audiobooks might be an option these days).