An Iranian official says international sanctions have forced Tehran to accept subway cars from China in place of cash payments for oil.
Amir Jafarpour, deputy head of Iran's Transportation and Fuel Management Committee, said the government ordered 315 carriages from Beijing for their subway system.
He says billions of dollars of payments from crude-oil exports to China have not been transferred to Iran because of international sanctions.
Jafarpour was quoted by the news website Tasnimnews.com on July 29 as saying, "The Chinese have frozen the money from the oil we sold them."
Western states have imposed sanctions on Iran because of its disputed nuclear program, saying it could be used to build atomic weapons.
Tehran has sought to bypass the sanctions by bartering for physical goods in exchange for oil.
Based on reporting by AP and Tasnimnews.com