The cost went up for Metra passengers who use 10-ride passes on Friday.
The 11 percent fare increase was approved last year.
10-ride passes now range from $2.75 to $9.25, depending on how far a person travels.
The increase affects about 25 percent of riders.
The fare hike is expected to generate $8 million more a year for Metra, which will go towards operations and capital improvement projects.