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The Arkansas Southern Railroad (reporting mark ARS) is a short-line railroad which started service in October 2005. ARS operates two disconnected lines consisting of Heavener, Oklahoma to Waldron, Arkansas (32 miles), and Ashdown to Nashville, Arkansas (29 miles), plus a switch track at Ashdown, for a total of 63 miles. The lines are leased from Kansas City Southern Railway (KCS) to ARS's owner, the Watco Companies (Watco).