A feasibility study that will explore options for a speedier Metro system will be completed by the end of the year, Song Jian, a chief engineer at the Shanghai Rail Transport Research Institute, said yesterday during a municipal meeting that focused on innovation.

But it might take years to put the system into use - and only after the crowds from Shanghai World Expo 2010 have departed, he said.

Those visitors will benefit from one major upgrade, however.

Also yesterday, the city unveiled plans to ensure wireless Internet access throughout the Metro system by 2010.

The city plans to build dozens of underground mobile stations to relay Internet signals, according to Bi Xiangli, deputy general manager of the Shanghai Shentong Rail Transport Advisory Co.

The express plan won't began to take shape until after the feasibility study is completed.

"The major purpose is to improve the efficiency of the subway," Song said.

Two basic concepts are being explored: trains that stop at alternate stations and trains that stop only at major stations during rush hours.

"It's possible that there will be express subway trains from rural Nanhui District to the downtown during rush hours," said Song, referring to Metro Line 11, which is now under construction.

Among the major stations that would probably be served by express trains are People's Square, Lujiazui and Zhongshan Park.

Song said an express system requires better communication and management because Shanghai's subway has only two tracks, compared to at least three in the New York subway, which runs express and local trains.

"It's reasonable to employ an express system, but the government must also think about those who don't benefit," said Zhao Guotong, a local transport expert.

He said the government should encourage city residents to ride bikes to subway stations if one near them isn't served by an express system.

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