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Preparations underway for reopening of upgraded Mexico City metro line
03:57

Line One is among the oldest metro lines in Mexico City. It's nearly 18 km long and is used by millions of commuters every day. But the service was suspended for a year while its trains and infrastructure underwent a major upgrade - with the help of China's top train maker CRRC Corporation Ltd. Our reporter got a close-up look at the final preparations before the line reopens this month.

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