Frustrated lawyers have called on China's rail authority to disclose how many train tickets are reserved for official use during the Spring Festival travel rush.

Requests submitted by two Beijing attorneys to the Ministry of Railways on Friday urged the authority to release the total number of train tickets available for sale between Jan 26 and March 6, this year's peak travel season, and the actual number being sold.

They also asked for information on the ratio of tickets being allocated to different booking systems, such as ticket booths and online sales.