I read a study long time ago, I can’t find it, it’s old, and I have not kept up with new publications so take all this with a huge grain of salt. The study found that not only does a public transit system need to be available and dependable, it needs a certain amount of people too. Once a critical number of commuters used public transit it passed a tipping point where even more people began to use it. The study concluded that people seeing people take public transit will increase the likelihood that they will choose public transit next time compared to people who saw deserted public transit. It’s a chicken and egg problem on top of everything else. Keep in mind I am not an expert and I am not current with the topic.