The Garfield Park “L” crossed over railroad tracks at bout 4600 West. Interestingly, note that between the two sides of the railroad embankment, the alley between Harrison and Flournoy is not quite in the same location. This may have something to do with the location of the “L”. It may be that east of the RR, the “L” was on the south side of the alley, while west of there, it was on the north side instead. It’s possible that the Garfield Park “L” ran in a straight line– it’s the position of the alley that changed, possibly because some of the alleyways on the west side were laid out after the “L” was built.