The Southern Arizona Transportation Museum preserves and interprets the history of railroads in southern Arizona. The one-time records vault building at the former Southern Pacific depot houses the museum. The city of Tucson purchased the building in 1998 and renovated it in 2004 to restore it to its 1941 style. Tucson Mayor Bob Walkup helped dedicate the museum on March 20, 2005, the 125th anniversary of the arrival of the railroad in Tucson. The centerpiece of this museum is Southern Pacific locomotive No. 1673. Schenectady Locomotive Works built the steamer in 1900, and it starred in the movie Oklahoma in 1955.