The Arizona Big Train Operators come chugging down the track to Mesa Main Library, 64 E. First St., from July 30 to Aug. 4 in a 500-square-foot, model-trains exhibit of G-scale (garden size) railroads with passing tracks, historical dioramas, bridges and villages.

The free exhibit is open 10 a.m.-7:30 p.m. Monday, July 30, through Thursday, Aug. 2; 10 a.m.-4:30 p.m. Friday, Aug. 3; and 10 a.m.-2 p.m. Saturday, Aug. 4.

Free rides for adults and children will be available aboard the Mesa Library Express trackless train 10:30 a.m.-noon and 2-4 p.m. on Friday, Aug. 3, and 10 a.m.-1 p.m. on Saturday, Aug. 4. Final pickups will be 30 minutes before closing time.

Two sets of four tickets for a train ride at McCormick-Stillman Railroad Park in Scottsdale will be raffled each day by Arizona Big Train Operators. A grand-prize at the end of the exhibit for two passes to the Grand Canyon Railway also will be raffled.

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