The city of Taonan, a most important center bordering on Mongolia, was reached from Szepingkai in about nine hours by express train. Our young colleague, the Rev. Allan Reoch, had been left in charge of the work there during the summer of 1938.
Source: wiktionary
Following the advice of his generals, Chiang did take the initiative after the fall of Changchun. His crack First Army moved up the railroad from Mukden to Szepingkai and retook Changchun on May 24, then headed farther north toward Harbin, the big city in northern Manchuria that was in Communist hands.
Source: wiktionary