The railway line will pass through China, Kazakhstan and Russia and cover more than 7,000 km, more than three times the world's current longest high-speed line, from the Chinese capital to the southern city of Guangzhou, China News Service quoted Beijing Municipal government as saying.
The project would cost more than 1.5 trillion yuan, USD 250 billion.
High-speed railways passing across the Korean Peninsula in Northeast Asia and linking China with West Asia as well as South Asia, are also on the schedule, it said.
China is due to conduct a feasibility study on the 1,754 km-long Chennai-New Delhi high-speed rail corridor. When completed, it would be the world's second largest bullet train line after China's 2,298 km-long Beijing-Guangzhou line which was launched last year.
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The communist giant has agreed to conduct the study free of cost during President Xi Jinping's visit to India in September last year.
Beijing is also pushing aggressively such projects in Latin America.