Beijing's subway could reach 561 kilometers in 14 years - making it the longest subway system in the world.
The official China Daily newspaper reports Monday that a plan has been drawn up to expand the subway network to 19 lines where it will reach all major corners of China's capital city.
Each of the system's current four lines carries 1.5 million people every day.
The paper says the expansion plan is still subject to government approval, but if adopted it calls for three lines to be completed in time for the 2008 Olympics.
Currently, London has the longest subway line in the world. It is 407 kilometers in length, has 12 lines and carries three million passengers a day.
Some information for this report was provided by Reuters.