Washington Park and Zoo Railway, railway in Portland, Oregon, USA

The Washington Park and Zoo Railway is a narrow-gauge train line in Portland listed on the National Register of Historic Places. The current route runs through the zoo grounds for about six minutes, while the original longer route through the park and forests no longer operates in full.

The first 1.2-mile section opened on June 7, 1958, before the zoo itself was finished. The steam locomotive Oregon, modeled on a Baldwin 4-4-0, ran at the Oregon Centennial Exposition in summer 1959 and entered zoo service in January 1960. The 1.4-mile extension to a station near the Rose Gardens opened on May 28, 1960. The line was renamed the Washington Park and Zoo Railway in 1978.

The railway's name reflects its original purpose of connecting Washington Park with the zoo for visitors. Today, the ride offers insight into how people experienced leisure and nature in the city during the 1950s.

The ride lasts about six minutes and requires a special ticket available at the zoo. The train operates regularly during zoo hours, with extra trips on holidays and special events.

The railway is the only one in the United States that still carries mail, and since 1961 it has had its own cancellation stamp. Mailboxes stand at the Zoo and Washington Park stations and on the Zooliner locomotive. The Oregon steam locomotive, a 5/8-scale model of the 1872 Baldwin-built Reno of the Virginia and Truckee Railroad, burns oil rather than wood or coal.