1. IEA (International Energy Agency) and UIC (International Union of Railways) (2019) The future of rail opportunities for energy and the environment
2. IEA (International Energy Agency) and UIC (International Union of Railways) (2017) Railway handbook on energy consumption and CO2 emissions
3. Fouracre P, Dunkerley C, Gardner G (2003) Mass rapid transit systems for cities in the developing world. Transp Rev 23(3):299–310
4. Comparisons of cities’ transportation modal shares and post-coronavirus prospects. https://www.sc-abeam.com/and_mobility/en/article/20201203-01/
5. Ten charts to help you understand the market environment and railroad transportation industry development possibilities in China in 2021. https://www.qianzhan.com/analyst/detail/220/210604-609e6443.html