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More than a quarter of Union Pacific Railroad's subdivisions are positive train control (PTC) ready, the Class I announced last week.UP has equipped 59 subdivisions with wayside devices, which include signals, switches and radios, according to a UP press release. The PTC-ready segments run from Southern California to Portland, Ore.; from Portland, Ore., to Pocatello, Idaho; and from Roseville, Calif., to Elko, Nev.In addition, 64 percent of the railroad's required locomotives and 85 percent of required radio towers have been equipped with PTC technology, UP officials said.As of Dec. 31, 2016, UP had invested $2.3 billion in PTC. The railroad's latest estimate for its total PTC implementation cost is $2.9 billion.