If you ride the CTA, you probably noticed the system has a crisis on its hands. More and more, the city’s unhoused population is using trains and buses as a last resort to find a place to stay. WBEZ’s Anna Savchenko explains the cause: a serious shortage in shelter beds combined with a pandemic-related increase in homelessness. Savchenko tells us about the roots of the crisis, what the city’s doing to intervene, and she talks about the social service agencies working to help the unhoused.