China  is expanding a 10,000-kilometer (about 6,200-mile) railway link to Iran  to diversify oil supply routes and reduce reliance on vulnerable sea lanes like the  Strait of Hormuz . But experts say trains cannot match the capacity of oil tankers, limiting its impact. Instead, the project underlines China's long-term approach to strengthening its energy security and developing resilience against global crises through diversification, infrastructure investment and reduced dependence on Middle