Major tunnel construction on a rail line linking China and Laos has been completed. The Huangzhulin tunnel is on the China section of the 508-kilometer Yuxi-Mohan railway line, a joint venture between the two countries. Construction of the tunnel, which consists of three parts that go through hills, began in 2016. The leaders of China and Laos promoted the project as a way to initiate more interconnectivity projects under the Belt and Road Initiative.