CHICAGO — The Regional Transportation Authority of Illinois board on Wednesday tapped its chief financial officer, Joe Costello, to serve as interim executive director beginning next month until a replacement for retiring director Stephen Schlickman is found.

It is a time of leadership transition for the agency. The board last month elected John Gates Jr. to serve as its new chairman, filling a vacancy left by Jim Reilly’s resignation last spring to serve as special trustee at the Metropolitan Pier and Exposition Authority.

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