Franklin Park is a village in Cook County, Illinois, United States. The population was 18,467 at the 2020 census, up from 18,333 at the 2010 census. It was named for real estate broker Lesser Franklin who bought acres of the area when it was a majority of farming fields.

The North Central Service (NCS) is a Metra commuter rail line running from Union Station in downtown Chicago through northwestern and far northern suburbs to Antioch, Illinois. In December 2022, the public timetable shows seven weekday departures from Chicago. This line does not run at all on weekends or holidays. While Metra does not explicitly refer to any of its eleven routes by colors, the NCS' timetable accents are lavender, a shade of purple. It is one of two Metra lines that do not have a specific color for a fallen flag railroad that used to operate on the route.