China’s Shanghai Metro is the largest metro system on the planet – and one of many busiest. CNN’s David Culver takes a take a look at how the huge metro-rail system is making ready for a greener future.
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China’s Shanghai Metro is the largest metro system on the planet – and one of many busiest. CNN’s David Culver takes a take a look at how the huge metro-rail system is making ready for a greener future.
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