Why does the express train from Hefei to Nanjing pass through Zhenjiang?

The express from Hefei to Nanjing has a transfer station in Zhenjiang. Express delivery companies generally have transfer stations, which is conducive to the delivery of express delivery. For example, Dayun's transfer station in Anhui may be responsible for the distribution of Jiangsu, Zhejiang, Shanghai and Anhui, that is, other express deliveries sent to Jiangsu, Zhejiang, Shanghai and Anhui from all over the country go to Anhui's transfer station first, and then the transfer station is distributed to Jiangsu, Zhejiang, Shanghai and Anhui, which can improve efficiency.