Subway trains have run through the 27.73-km tunnel for Wuhan Line 2, which links Wuchang and Hankou -- two major areas of the city -- over the past three months. But passengers will only be allowed to board the trains on Dec. 28 when the test run starts, officials with the Hubei provincial transportation bureau said Tuesday.

The subway line has recently passed the experts' assessment, the state media cited officials.

It will be Wuhan's first subway, which is estimated to transport at least 600,000 passengers daily by 2015.

As a key transportation route, the line is expected to handle half of the city's cross-Yangtze traffic flow, easing gridlock on bridges over the river.

The construction costs around 14.9 billion yuan (2.37 billion US dollars), according to estimates.

The 6,300-km Yangtze River, which originates in northwest China's Qinghai Province and flows through 10 provinces and municipalities before emptying into the East China Sea, is a major transport link between the west and east China. More than 100 bridges across the river are in use.