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SunRail over the weekend conducted positive train control (PTC) testing along a 17-mile segment between Sanford and Winter Park, Florida.The testing included uphill and downhill brake tests at defined speeds and grades to verify braking performance, SunRail officials said in a press release. The PTC test train consisted of two locomotives, four coaches and one cab car to simulate a fully-weighted SunRail train.The data obtained during the tests will be programmed into the railroad's PTC system, which will be implemented along a 13-mile stretch by year's end. Full implementation on SunRail's entire 61.5-mile corridor is expected in late 2019.SunRail recently received a $15 million grant for PTC implementation. Wabtec Corp. is designing, installing, testing and commissioning the railroad's PTC system under a $62 million contract.Earlier this month, the U.S. Government Accountability Office reported that many commuter railroads are lagging in performing PTC tests.