Geoffrey Baer tracks down answers for three questions about Chicago's bygone streetcar heyday. 

Geoffrey Baer tackles three questions about Chicago's beloved rapid transit system, including the various spellings of the system, in this encore edition of Ask Geoffrey.

Geoffrey Baer tackles three questions about Chicago's beloved rapid transit system, including the various spellings of the system, old downtown entrances between elevated stations and Loop stores and a mysterious tunnel a viewer spotted while riding the Blue Line.