Beijing put four subway lines into operation on Sunday, part of the city's efforts to expand rail transit to ease severe traffic congestion. The new lines bring the number of subway lines in Beijing to 16, with a total length of 442 kilometers, according to authorities.

Few passengers are seen on a subway train of the second phase of subway line 10 in Beijing, capital of China, December 30, 2012.

 

 

A passenger poses for photos in front of a wall painting at the Nanluoguxiang Station of the newly-opened subway line 6 in Beijing, capital of China, December 30, 2012.

 

 

Passengers are seen at the Songjiazhuang Transfer Station linking different subway lines in Beijing, capital of China, December 30, 2012.

 

 

Passengers are seen at the Songjiazhuang Transfer Station linking different subway lines in Beijing, capital of China, December 30, 2012.