Organization mode of suburban railways in urban rail transit system

Rebuilding suburban railway to participate in urban rail transit is the objective requirements of sustainable development of rail transit in megacity. The organization mode is an important constraint factor, and it has a direct impact on the construction investment, operating costs, organization and management of railway. The paper analyzes the investment, operation and management of railway network in Tokyo City Group, Paris City Group, London City Group and New York City Group one by one. Then, summarizes five organization modes form them; meanwhile, analyzes their transplant to China under public ownership for suburban railway participating in urban rail transit and the advantages and disadvantages of these transplanted modes. On this basis, discusses the adaptability of the five modes in China, and then finds out that the "public-managed" modes are effective ones. Finally, takes suburban railway Line S2 in Beijing as a case study, and study the investment, operation, management and capacity assignment for rebuilding the suburban railway lines which have superfluous transport capacity like S2 to join the urban railway system in megacities. The results provide decision supports for the government to build adapted companies to run railway lines after suburban railway participating in urban rail transit.