OUTDATED, HISTORICAL VERSION -- Lines representing approximately where the CTA 'L' (rail) lines are. To view or use these files, special GIS software, such as Google Earth, is required.
data.cityofchicago.org (2011). CTA - 'L' (Rail) Lines - KML (Deprecated February 2015) [Illinois--Chicago]. City of Chicago Data Portal. https://data.cityofchicago.org/d/m3d6-pubu (web service)