The Tidewater Southern Railway Historical Society maintains a railroad museum at the San Joaquin County Fair grounds in Building #1 behind the Administrative Office. The Historical Society is dedicated to preserving and disseminating the historical record of the Tidewater Southern Railway. Their museum displays artifacts and information of the Tidewater Southern along with a railroad display that depicts many of the sites along the Tidewater Southern.

The Tidewater Southern Railway Historical Society was incorporated in the State of California on August 4, 1992, as a nonprofit public benefit corporation for charitable and public purposes. The Society received 501(c)(3) non-profit, tax-exempt status from the Internal Revenue Service on July 27, 1992, for the purpose of collection, preservation, restoration, and archival, and the maintaining of a museum for exhibiting, of Tidewater Southern Railway artifacts, memorabilia, historical data and information, and railway equipment. Also, exhibiting for educational purposes of historical data, artifacts, memorabilia, and railway equipment of the Tidewater Southern Railway, and the advancement of railroad preservation in general.