There is no train station in Suqian city, the nearest ones are in Shuyang County, Xuzhou city and etc. By train, you could take one D train to Xuzhou first with around 6hrs and then take a bus to Suqian. Or, you could take the long-distance bus directly from Beijing which costs about 8.5hrs. From Suqian to Changzhou, you could take bus directly or take a bus to Xuzhou first and then take a D train costing around 3.5hrs to Changzhou.