This looks like it may be affixed to a door or wall of an old train carriage (see the window just above the placard), which means the type on the rail map is incredibly small. The naming of the main railway station as “Public Square” rather than “Tower City” means this map is pre-1991 (when the station changed names), although the general aesthetics and typography would lead me to suspect that this map is from the late 1970s.

Source: unit2345/Flickr