I was exploring Bronzeville and related south side sites recently and came across an old above ground level train right of way (heading east and west) at Vincennes and about 39th. No bridge over the street anymore though. So I kept driving around and found more pieces of this visible from S Lake Park, Drexel and Cottage Grove. Here's my google album of a few captioned pictures, including a google maps view which shows the now brush-covered tracks.
I checked Historic Aerials and see that the 1962 view seems to show an operating track with bridges, with the track heading east and merging into tracks parallel to the lakefront. The next 1970s view shows the bridges gone, so it must have closed down by then.
Any info as to what line this was?