Yes, in the 50's boulevards had brown and white signs naming them at intersections, whether it was 2 boulevards or a boulevard and a city street. At that time the Park District, which is a separate municipal corporation, maintained the boulevards and its own facilities. The park district at that time also had its own police department, originally North Parks, South Parks and West Parks. Those three merged into one department and sometime around 1955 or so they merged into the Chicago Police Department.