The Magma Arizona Railroad was built by the Magma Copper Company and operated from 1915 to 1997. The railroad was originally built as a narrow gauge line, but was converted to in 1923. Originally headquartered in Superior, Arizona, the company primarily hauled cattle and copper on of standard gauge track to and from the Southern Pacific mainline in Magma, Arizona, between Florence and Queen Creek. BHP purchased the Magma Copper Company and its lines in 1996 for A$3.2 billion and suspended rail operations on this line a year later. The Magma was the last industrial short line railroad to use steam power, dieselizing on September 4, 1968. Revival The railroad has since changed hands and is currently owned by Resolution Copper, a joint venture of Rio Tinto and BHP. Exploration in 2001-2003 resulted in the discovery of a large copper ore body some beneath the surface of lands just east of Superior. If the mine is eventually reopened, it is highly likely the Magma Arizona will be revived to transport the of ore to off-site smelters. Discussions with representatives of Resolution indicate the Magma Arizona name will be kept if the mine and railroad are both reopened, which may occur after feasibility studies are completed in 2009. Locomotives Roster Engine No. 3, an Alco RS3, was built in 1955 and was used by the MAA for 44 years before being sold in 1999 to the Blacklands Railroad in Sulfur Springs, Texas, and then sold again in 2004 to the Oklahoma Railway Museum for static display. In 2018, it was purchased by the Arizona State Railroad Museum foundation, who moved it to Williams, Arizona, and it is temporarily stored at the Grand Canyon Railway's yard, until the ASRM's own building finishes construction. Engine No. 5, a , was the only standard gauge steam locomotive acquired new by the Magma Arizona. After Retirement in 1968, it was later sold to the Oregon Pacific & Eastern Railroad. It's now on display at the Galveston Railroad Museum in Galveston, Texas. The locomotive also had a few movie roles in Bearcats!, 1971 and Emperor of the North Pole, 1973. Engine No. 6 is a Baldwin Locomotive Works built in October 1907 and operated until 1960. It is now on display at the McCormick-Stillman Railroad Park in Scottsdale, Arizona. Engine No. 7, a Baldwin , was built in 1917 for the Tremont and Gulf Railroad, who