The Walt Disney World Railroad (WDWRR) is a 3-foot (914 mm) narrow-gauge heritage railroad and attraction located within the Magic Kingdom theme park of Walt Disney World in Bay Lake, Florida, in the United States. Its route is 1.5 miles (2.4 km) in length and encircles most of the park, with train stations in three different park areas. The rail line, constructed by WED Enterprises, operates with four historic steam locomotives originally built by Baldwin Locomotive Works. It takes about 20 minutes for each train to complete a round trip on the WDWRR's main line loop. On a typical day, the railroad has two trains in operation; on busy days, it has three trains.
The WDWRR's development was led by Roger E. Broggie, who also oversaw the construction of the Disneyland Railroad in Disneyland in Anaheim, California. The attraction's locomotives were acquired from the Ferrocarriles Unidos de Yucatán, a narrow-gauge railroad system in Mexico. After being shipped to the United States, they were altered to resemble locomotives built in the 1880s and restored to operating condition. Each locomotive was also given a set of passenger cars, which were built from scratch.
The WDWRR opened to the public for the first time on October 1, 1971, the same day that the Magic Kingdom park opened. Since then, the WDWRR has become one of the world's most popular steam-powered railroads, with about 3.7 million passengers each year. The WDWRR closed temporarily on December 3, 2018, due to the construction of the Tron Lightcycle Run roller coaster attraction near the Tomorrowland section.