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Short explanation for a 7-year-old: A subway is a train that goes under the streets in tunnels so people can get places fast.

  1. A subway train zooms through tunnels under the city to get you there quickly.
  2. The subway goes under the streets in tunnels to take people where they want to go fast.
  3. You ride a subway in underground tunnels so you can travel quickly beneath the city.

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