Dorval Carter is out at the CTA. The transit agency president announced his retirement Monday in a CTA news release, after years in the hot seat as riders complained about unreliable service, conditions on trains and buses and concerns about personal safety. He will step down at the end of this month, according to the release. His retirement comes as a debate brews in Springfield about whether to combine the CTA with Metra, Pace and the Regional Transportation Authority, and how to fund transit amid a $771 million budget gap looming when federal COVID-19 relief funding runs out.