A plan to run more frequent ACE commuter trains between Stockton and San Jose and extend the service to Manteca and Merced will be aired in four public meetings this month in Livermore, Tracy, Fremont and Modesto.

The public is invited to drop in for part or all of the meetings between 5 and 8 p.m. to learn about the plan or make public comments on it. The meetings are at:

Fremont: 5 p.m. Tuesday at the Fremont Senior Community Center, 40086 Paseo Padre Parkway.

Modesto: 5 p.m. Wednesday at the Stanislaus County Library's Modesto branch, 1500 I St.

Livermore, 5 p.m. Monday, at the Civic Center Library community rooms A and B, 1188 South Livermore Ave.

Tracy: 5 p.m. July 30 at the Tracy Transit Station, 50 East Sixth St.

The San Joaquin Regional Rail Commission is conducting the meetings as part of an environmental review of the plan for expanded Altamont Commuter Express service, including expanding the Stockton to San Jose trips from four to six as soon as 2018 and to 10 daily trips around 2022.

The so-called ACEforward plan also will investigate moving the train route so trains stop in downtown Tracy.

For more information, visit www.acerail.com/

Contact Denis Cuff at 925-943-8267. Follow him at Twitter.com/deniscuff