11 a.m. to 4 p.m. weekends and holidays only The Balboa Park Miniature Train is operated by the San Diego Zoo. The train pulls out of the station for 3-minute rides around a portion of Balboa Park. The train station is located outside the Zoo’s exit. Obtain a hand stamp at the Zoo's exit for same day re-entry. Train tickets are $3 for ages 1 and older; younger than age 1 is free. Ages 5 and younger must ride with a paying adult.