“Two Glorious Expositions, One Golden State: Celebrating the Panama Canal in 1915” at the California State Railroad Museum educates visitors about two large-scale expositions that celebrated the opening of the Panama Canal in 1915 – one in San Francisco and one in San Diego. Near the exhibit, which will remain through Jan. 10, is the museum’s 9-inch gauge Overfair Railway locomotive No. 1915, constructed for one of the 1915 expositions. Open daily 10 a.m.-5 p.m., $5-$10, children 5 and under free; 125 I St., Sacramento. www.csrmf.org; (916) 323-9280.