Having parallelled the Santa Fe all the way from Joliet, we are now at Fort Wayne Junction south of downtown Chicago, where the GM&O curves northward toward Union Station and the Santa Fe continues toward Dearborn Station. This interlocking was called Fort Wayne Junction by the Alton Route (later, the GM&O) because it is where the Alton joined the Pennsylvania Railroad's main line from the east via Fort Wayne (originally, the Pittsburgh, Fort Wayne & Chicago Rail Road). The Pennsylvania Railroad called it "Alton Junction."