Staff have proposed either a 25-cent increase in Caltrain's base fare, or a 25-cent base fare increase plus an additional 25-cent increase in the per-zone fare.
Agency officials say a fare hike is necessary because of higher fuel costs.
Under the first proposal, the base fare would go up from $2.25 to $2.50, while fares for traveling between Caltrain's six zones would remain unaffected.
Under the second proposal, the fare to travel from one zone to another would also increase, from $1.75 to $2.
Tonight's meeting will be held at 6 p.m. at the Santa Clara Caltrain station, located at 1005 Railroad Ave. in Santa Clara.
The third meeting is scheduled for 6 p.m. Wednesday in the Koret Auditorium of the San Francisco Main Library at 100 Larkin St. in San Francisco.
A public hearing on the fare hikes is scheduled for Sept. 4, with a possible vote by Caltrain's board of directors on Oct. 2.
Those unable to attend the meetings can submit comments by calling (800) 660-4287 or by e-mailing firstname.lastname@example.org.
If either proposal is approved by the board, the fare hike will go into effect Jan. 1.