Thorndale is an 'L' station on the CTA's Red Line. It is an elevated station located at 1118 West Thorndale Avenue (directional coordinates 5900 north, 1200 west) in the Edgewater neighborhood of Chicago, Illinois. The adjacent stations are Granville, located about one quarter mile to the north, and Bryn Mawr, about one half mile to the south. Four tracks pass through the station, but there is only a single island platform in the center of the tracks; Purple Line weekday rush hour express service use the outside tracks but do not stop at this station. Thorndale is named for the Thorndale station in the community of the same name, which is west of Philadelphia. Many of the streets (and thus CTA stations) in the Edgewater neighborhood are named after stops on the former PRR Main Line.
A temporary station opened at Thorndale in 1915. This was replaced with a permanent station built to a design by architect Charles P. Rawson in 1921 as part of a project by the Northwestern Elevated Railroad to raise the tracks between Wilson and Howard onto an embankment.
Closure of the Thorndale station (along with Lawrence, and Jarvis on the Red Line and South Boulevard and Foster on the Purple Line) is proposed in of three of the CTA's six potential options for the renovation of the Purple Line and northern section of the Red Line. In two plans, the station would be replaced by new auxiliary entrances at Glenlake from Granville and Hollywood from Bryn Mawr. In the third, replacement would be by auxiliary entrances at Elmdale from a new subterranean station at Glenlake and at Hollywood from an new station at Bryn Mawr.