Building a Greater New York

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Across
  1. 3. "The heart of New York City" busy, and more
  2. 6. The companies that controlled the subway routes and stops
  3. 7. The building of all projects, using tools, and breaking ground
Down
  1. 1. Located under the sidewalks and roads
  2. 2. An underground railroad, in this case located in New York City
  3. 4. The city that grew, expanded, and was busy
  4. 5. A part of transportation that occurs above ground, below ground, on railways and tracks.
  5. 8. Where the subways traveled, and allowed them not to tip and kept them stable