Related Links: The Ten Most Noteworthy Rail Projects: Overview and Related Stories Project: Lanzhou-Chongqing Railway Cost: $11.3 billion Construction Period: 2008-14 Lanzhou is a city of heavy industry and petrochemicals, located on the south bank of the Yellow River in northwest China. With a population of 2.2 million, it is the capital and largest city in Gansu Province. About 800 kilometers to the south, Chongqing, a manufacturing center on the Yangtze River in Sichuan Province, is one of the largest municipalities in China, with a population of 30 million. The Qinling Mountains sit between the two. The Lanzhou-Chongqing Railway project
The 2016 Summer Olympics boating and swimming events have put an international spotlight on what has been a long-running problem in Rio de Janeiro—untreated sewage and trash are clogging up major bays and waterways.