 The railroad was built by the American Trona Company in 1914, to serve the mining company's shipping to an interchange with the Southern Pacific Railroad.The company and its Trona Railway has had various subsequent owners, including American Potash & Chemical Corporation, Kerr-McGee Corporation, IMC Global, Sun Capital, LLC, before the current ownership of Searles Valley Minerals, Inc. On Dec. 27 2007, Karnavati Holdings, a subsidiary of Nirma Limited, acquired all of Searles Valley Minerals, Inc.In the 1920s, the Epsom Salts Monorail delivered epsomite to the Trona Railway at Magnesium Siding, about south of Trona.