Shanghai World Expo Park is going on trial operation from Tuesday to Sunday, with five comprehensive drills to be performed during the period, the Yangtse Evening Post reported Tuesday.

The first comprehensive drill started on Tuesday, with an estimated 200,000 people participating. The Expo Park is to open at 9:00 am and close at 8:00 pm during the trial operation.

The city's subways saw their first comprehensive drill Tuesday for the World Expo with passengers on board. The drill is expected to enhance the subway system's capability of handling huge passenger flows and sudden failures.

A total of 118 Expo volunteers from Shanghai-based Fudan University have also started their work Tuesday. They are the first batch of volunteers to serve the Shanghai World Expo, according to the newspaper.