China has rapidly expanded its high-speed rail (HSR) network over the past decade and aims to complete a national HSR network by 2020. This will connect major cities and consolidate China's economic centers. While HSR can carry some goods, its main economic impact will be on passenger travel and the flow of people and services. It may accelerate the formation of megacity clusters in China and boost connectivity between economic regions along HSR corridors. Regionally, a proposed China-ASEAN HSR line could consolidate China's role in Asian trade and Singapore's position as a major services hub, while some medium-sized cities may lose out to larger hubs connected by HSR.