An electric railway operating below the surface of the ground (usually in a city)
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On weekdays as many as 9 million people use the subway system.
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This is made possible by the introduction of a seven-stop subway system.
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Hop on board the newest part of the world's biggest subway system.
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It is used on the signage in New York's subway system.
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They said they would try their luck on the subway system.
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Troops roamed the area and some were positioned on an overhead subway system.
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Tokyo subway system construction dramatically expanded the sphere of INKling activity.
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Seoul has built the most extensive subway system in the world.
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Other stations were closed when the subway system was extending platforms.
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Just a bite, my good man, and then back to the subway system.
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In fact, the entire subway system lay soundless under the city.
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If you're new to NYC, the subway system can be a confusing beast.
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Facebook Twitter Pinterest Cincinnati's subway system under construction in the 1920s.
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We have dogs that we've specially trained to work in the subway system.
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Today, there is an entire six-mile subway system abandoned underneath the Cincinnati streets.
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They are grateful for your detailed report on the situation in the subway system.