The Walt Disney World Railroad (WDWRR) is a 3-foot () 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 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. History Discovery in Mexico The development of the Walt Disney World Railroad (WDWRR) from the late 1960s to its opening in 1971 was overseen by Roger E. Broggie, vice president and general manager of Mapo, Inc., WED Enterprises' research and manufacturing branch. Broggie previously supervised the building of the Disneyland Railroad in Disneyland in Anaheim, California. From his experience with the railroad at Disneyland, Broggie determined that it was better to use existing steam locomotives, rather than building them entirely from scratch like the Disneyland Railroad's first two locomotives. In 1968, he contacted rail historian Gerald M. Best who recently wrote Mexican Narrow Gauge, a book containing information about locomotives that could be obtained from a railroad boneyard in Mérida, Yucatán, Mexico, owned by the Ferrocarriles Unidos de Yucatán. This was a narrow-gauge system, the same gauge as the Disneyland Railroad. In 1969, Broggie, along with fellow Disney employee and railroad-building expert Earl Vilmer, went to Mérida to investigate. They determined that four locomotives built by Baldwin Locomotive Works could