A Short History of Public Transportation

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Across
  1. 2. something that makes an environment unsafe
  2. 4. full of people
  3. 6. being very productive with little waste
  4. 7. to promote the growth or development of
  5. 9. power for light, heat, machines, etc.
  6. 10. to increase in extent or number
  7. 11. a particular place
  8. 12. to become less in amount or lower in number
  9. 15. a train underground
Down
  1. 1. two or more groups trying to secure more business
  2. 3. a group of different parts that work together
  3. 5. to manage or run a business or system
  4. 8. in particular, particularly
  5. 13. to lift up or make higher
  6. 14. of small width