We don't have that here in this small town; however, when I used it years ago, they were very crowded; most of the time, I had to stand, and I never saw anyone give up a seat for anyone.
Ha ha, that's what public transport system is. But metros are much better. They are crowded of course, but they are the fastest way of transport in cities. If you go by road, it will take 3 times the time.