Mayor Lori Lightfoot and the CTA escalated a mystifying turf war recently against Cook County and Metra on Chicago’s South Side: CTA announced Feb. 10 that it would spend $38 million to study an extension of the Red Line to 130th Street. The proposed project is not just expensive for an aboveground rail line — its cost, $2.3 billion for 5.3 miles, could pay off CTA’s entire unfunded pension liability — but it also serves an area already covered by two Metra lines, Rock Island and Metra Electric.