Rail officials reported that unprecedented numbers of tickets are being returned by holiday passengers and suggested that more than 10 percent of the tickets bought could have been returned by the end of China's holiday travel rush this year.

Experts are suggesting the reason could be more flexible purchasing periods for tickets and lower charges to return a ticket.

According to a report on China Central Television, more than six million tickets have been sold daily during the rush so far, with around 700,000 of those being returned.