The Rock Island District (RI) is a Metra commuter rail line from Chicago, Illinois, southwest to Joliet. Metra does not refer to its lines by color, but the timetable accents for the Rock Island District line are "Rocket Red". This refers to the Chicago, Rock Island and Pacific Railroad's Rocket passenger trains.[3] Metra MP36PH Metra F40PHM Metra F40PH ES44AC – IAIS
