METRA is the commuter rail division of the Regional Transportation Authority of the Chicago metropolitan area
Bikes are permitted on the METRA, provided they are properly secured, subject to restrictions:
-No Bikes Permitted during busy hours of morning and evening commute
-Bikes may be restricted at conductors discretion and availablility of handicapped seating
Bikes on Trains metrarail.com
Furthermore, bicycles may be restricted during special events, including
St. Patricks Day Parade
Taste of Chicago
Air and Water Show
Lolapalooza
(and other Special Events, such as Blackhawks Stanley Cup Rally)
Gypsy Bicycle 