Chen Gang, vice mayor of Beijing, said the capital city would invest 100 billion yuan (about 15.9 billion U.S. dollars) building more subways in the future. The announcement of increased funding plan follows 260 billion yuan of investment the city has already completed in the construction of subway systems in the city. Speaking at a panel discussion with other delegates to the 18th National Congress of the Communist Party of China on Friday, the vice mayor said the increase in investment would be used to construct 200 km of subway lines. The city aims to expand the total length of its subway networks to 660km from 442 km at the end of 2012, Chen said.