A new railroad network spanning tens of thousands of kilometres connects China directly to Europe and is changing how commodities are transported. Historian Sam Willis teams up with Journalist Li Qiuyuan to dig into historical legacies of the past and explore how today's rail link compares to the caravans of the past - from Yiwu, the most eastern terminus of the China-Europe Railway Express to Chengdu; the busiest train station in China's Southwestern province of Sichuan.