For those wondering what's going on here -- the Forest Hill Flyover was opened as of the day this edit was made (see https://www.trains.com/pro/freight/chicago-railroads-celebrate-completion-of-forest-hill-flyover/ for details).  This edit is considered "interim" because it is a best-effort interpolation of the track infrastructure to remove the at-grade crossings and shoofly trackage; we'll need 2026 aerials to come up with a final map for this.