Question

Which is the biggest underground railway network ?​

Answer 1

Answer:

The Beijing Subway is the world's busiest and longest metro system, while the New York City Subway has the greatest number of stations. The country with the most metro systems is China, with 39 operational.

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Answer 2

The Beijing Subway is the world's busiest and longest metro system, while the New York City Subway has the greatest number of stations. The country with the most metro systems is China, with 39 operational.

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