Another thread started to wander in the direction of conditions on some systems, especially CTA, since the pandemic. This is a fairly representative picture of the situation, especially late/over night. Though I do think that riding further north on these lines around or after midnight would have effaced more mischief and the sense of discomfort that a lot of riders have felt of late.
While I ride CTA trains a few times a week, I was interested in getting a better sense of what conditions are like on the El at other times of the day. So I hung out on the Red and Blue routes from 5pm to 5am.