The Omaha Zoo Railroad (OZRR) is the name of a 2 ft 6 in (762 mm) narrow-gauge heritage railroad located in the Henry Doorly Zoo & Aquarium in Omaha, Nebraska. The railroad offers a narrow gauge excursion train for zoo visitors hauled by a steam locomotive. The train loads passengers at two stations within the zoo. Annual ridership of the Omaha Zoo Railroad is over 200,000 people.