L-series
Encyclopedia
The L-series trains are temporary trains run by railway bureaus of the People's Republic of China
People's Republic of China
China , officially the People's Republic of China , is the most populous country in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres...

 at times when they are thought to be necessary, such as the Chunyun
Chunyun
Chunyun, , also referred to as Spring Festival travel season, or Chunyun period, is a period of travel in China with extremely high traffic load around the time of the Chinese New Year. The period usually begins 15 days before the Lunar New Year's Day and lasts for around 40 days...

period.
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