Chicago Transit Authority, also known as CTA, is the operator of mass transit within the City of Chicago, Illinois and some of its surrounding suburbs. - Source: Wikipedia
CTA said security camera video “proved to be vital” in helping investigators.
4 people fatally shot on Chicago-area commuter train, police say →
The agency said each electric bus manufactured by Proterra costs about $900,000 under the CTA's contract for a total of 23 buses.
Chicago Transit Authority tests electric buses →
