Using the Mukden Incident as a pretext to invade Manchuria, Japan created the puppet state of Manchukuo in March 1932; Changchun was designated the capital city, and was renamed Xinjing (Shinkyō), and the line was renamed once again, becoming the Renkyō Line at that time. The "Asia Express", a world-class limited express train, was introduced on 26 September 1934 between Dalian and Xinjing. The Manchukuo National Railway, which had taken over the remainder of the Chinese Eastern Railway, finished the conversion of the Jingbin Line from Xinjing to Harbin from broad gauge to standard gauge on 31 August 1935, and from 1 September the Asia Express service was extended to Harbin.