The operation length of the Beijing metro will reach 336 kms by the end of 2010 from the current 228 kms, according to the city's metro operation company Tuesday.

Five new lines are currently being tested and operational trials will soon begin, said an official of Beijing Subway Operation Co. Ltd.

Beijing will have a total of 14 metro lines once the new lines are completed by the end of this year, he added.

Presently the metro network runs about 4,000 trains a day, 2,500 more than 2005 when its operational length was only 114 kms. Also since 2005 daily passenger numbers grew from 1.86 million to 5.02 million people, the official said.