The first test run with active tilting was conducted in the presence of the media on May 22, 2007, between Osong Station and nearby Ogeunjang Station on the Chungbuk Line. At the time, the train was planned to enter service in 2010. Until December 21, 2008, the train ran over in test runs on the Chungbuk Line, short of the planned. The test program of was completed until the end of 2009, with test runs on the Chungbuk, Jungang, Honam, Gyeongbu and Taebaek Lines followed by high-speed testing on the Gyeongbu High Speed Railway (Gyeongbu HSR), with achieved at 00:33 on November 19, 2009, between Osong and Daejeon. In a further test in September 2010 on the not yet opened second stage of the line between Daegu and Busan, the train achieved .