Passengers will have access to 4G networks on the platforms, in the carriages, at the entrances and in the tunnels.
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It said some metro lines, such as Line 4 and Line 9, recently introduced the latest global mobile standard as the city vows to upgrade its network and infrastructure.
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Cheng Yue, a 26-year-old Beijing resident, was looking forward to the 4G coverage.
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"Most homes and offices now have Wi-Fi access, and the subway is where people are still unable to easily surf the Internet," she said. "I'll even consider getting a 4G smart phone for the experience."
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Zhang Zhuting, a professor at the Ministry of Transport's Management College, said 4G networks in the subways would help make commuting more efficient.
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"So many people commute daily in the capital. Providing a better Internet network will certainly make the travel time more enjoyable for them," he said.
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More than 7.93 million subway trips were made on Sunday, according to the Beijing MTR Corp and Beijing Subway.
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Zhang said the 4G coverage on the metro might also boost the development of Beijing's fourth-generation telecommunications services.
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4G reached China late in 2013, and many public places are not yet covered by the networks.Â