General information
  Rail modes: Heavy rail and Regional rail
  Number of heavy rail lines: 7
    Red, Blue, Green, Orange, Brown, Purple, Yellow
  Number of regional rail lines: 12
    Union Pacific North, Union Pacific Northwest, Union Pacific West, Milwaukee District North, Milwaukee District West, North Central Service, Burlington Northern Santa Fe, Southwest Service, Heritage Corridor, Rock Island District, Electric, South Shore
  Operating agencies:  
    Chicago Transit Authority (CTA) - operates all heavy rail lines
    Northeast Illinois Regional Commuter Rail Corporation (Metra) - operates 11 regional rail lines (all except South Shore)
    Northern Indiana Commuter Transportation District (NICTD) - operates 1 regional rail line (South Shore)
  Number of heavy rail stations: 144
  Number of regional rail stations: 254
  Heavy rail bi-directional route length: 166 km (103 mi)
  Regional rail bi-directional route length: 908 km (564 mi)
  Annual heavy rail ridership (2003): 150.3 million
  Annual regional rail ridership (2003): 71.7 million
       
System maps
  Heavy rail: CTA map
  Regional rail: Metra map and NICTD map
  Downtown map showing all rail lines and stations in Downtown Chicago.
  CTA system map showing all rail lines and stations in Chicago and immediate suburbs.
  RTA system map showing all rail lines and stations in the entire metropolitan area.
       
Transfer points and connections to other transportation systems
  Connections between heavy rail and regional rail
    All connections in Downtown Chicago can be viewed on the Downtown map.  Outside Downtown there are the following transfer locations:
Heavy rail station   Regional rail station
Davis (Purple) and Davis (Union Pacific North)
Damen (Brown) and Ravenswood (Union Pacific North)
Jefferson Park (Blue) and Jefferson Park (Union Pacific Northwest)
Montrose (Blue) and Mayfair (Milwaukee District North)
Harlem/Lake (Green) and Oak Park (Union Pacific West)
Western (Blue Cermak branch) and Western (Burlington Northern Santa Fe)
Roosevelt (Red, Green, Orange) and Roosevelt (Electric, South Shore)
  Connections between heavy rail and Amtrak (National Railroad Passenger Corporation)
    Clinton (Blue) and Quincy (Orange, Brown, Purple) are within walking distance of Union Station (Amtrak).
  Connections between regional rail and Amtrak (National Railroad Passenger Corporation)
   
Station Transfer between Amtrak and
Union Station Milwaukee District North, Milwaukee District West, North Central Service, Burlington Northern Santa Fe, Southwest Service, Heritage Corridor
Glenview Milwaukee District North
Naperville Burlington Northern Santa Fe
Joliet Rock Island District, Heritage Corridor
Homewood Electric (University Park branch)
Ogilvie TC (Union Pacific North, Union Pacific Northwest, Union Pacific West) and LaSalle (Rock Island District) are within walking distance of Union Station (Amtrak).
  Connections between heavy rail and airports
    O'Hare (Blue) is located at O'Hare International Airport.
    Midway (Orange) is located at Midway Airport.
  Connections between regional rail and airports
    South Bend Airport (South Shore) is located at Michiana Airport.
       
Travel times
  Travel times by rail transit in the metropolitan area
       
Hours of operation
  Round-the-clock service (24 hours a day, 7 days a week):
    Red (all stops), Blue (O'Hare - Forest Park).
  Full-time service (7 days a week, last train from Downtown after 23:00):
    Blue (Cermak branch), Green (all stops), Orange (all stops), Brown (all stops), Purple (Linden - Howard), Union Pacific North (Ogilvie TC - Waukegan), Union Pacific Northwest (Ogilvie TC - Crystal Lake), Union Pacific West (all stops), Milwaukee District North (all stops), Milwaukee District West (Union Station - Elgin), Burlington Northern Santa Fe (all stops), Rock Island District (LaSalle - Joliet via Suburban line), Electric (Millennium Station - University Park and South Chicago branch), South Shore (Millennium Station - Carroll Avenue).
  Weekday-only service (last train from Downtown after 20:00):
    Electric (Blue Island branch) - also operates on Saturdays; Yellow (all stops), Milwaukee District West (Elgin - Big Timber), North Central Service (all stops), Southwest Service (Union Station - 179th).
  Infrequent and irregular service (7 days a week, a few trains throughout the day):
    Union Pacific North (Waukegan - Kenosha), Union Pacific Northwest (Crystal Lake - Harvard), South Shore (Carroll Avenue - South Bend Airport).
  Rush-hour-only service (weekday mornings and evenings only):
    Purple (Howard - Loop), Union Pacific Northwest (McHenry branch), Southwest Service (179th - Manhattan), Heritage Corridor (all stops), Rock Island District (Main line).
  For more information, see the official CTA, Metra and NICTD schedules.
       
Service frequency
  Heavy rail service frequency in the metropolitan area
  Regional rail service frequency in the metropolitan area
  Selected Downtown stations totals
       
Future development of the system
 
Project Rail mode New route length Number of new stations Expected completion
Laraway Road (Southwest Service) infill station Regional rail 0 1 2006
Grand/Cicero (Milwaukee District West) infill station Regional rail 0 -1 (1 to open and 2 to close) 2006
Oakton (Yellow) infill station Heavy rail 0 1 2008
Red - Blue lines connector Heavy rail 200 m 1 2008