built in 1983 and opened on January 4, 1984. Electrification is at 50 kv AC overhead wire. The coal it hauls on the is used by the power plant at its western terminus to power the line itself. The line does not connect to the national rail network. Navajo Mine Railroad The Navajo Mine Railroad operates between the Four Corners Generating Station and BHP's Navajo Coal Mine in New Mexico. The line started operation in 1974 using diesel locomotives and was electrified in 1984 because diesel operation was too expensive with the increasing train loads, fuel prices and problems with clogged oil bath filters on the diesel locomotives due to the excessive coal dust. Electrification is at overhead line. The railroad does not have any connection to the rest of the American rail network. Martin Lake Line The Martin Lake Line, owned by Luminant, once operated an electrified coal hauling line operating between mines in Beckville to the Martin Lake Power Plant in Texas. The railroad operated GE E25Bs and GE E60s, but electrification was dismantled and dieselized in the early 2010s. Testing The Transportation Technology Center in Pueblo, Colorado maintains a test track in length. Acela trains are tested at this site. See also Rail transportation in the United States List of railway electrification systems References United States