Transportation

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Across
  1. 4. oldest wheel was discovered here
  2. 6. means of public transport in cities
  3. 7. Wright brothers invented this
  4. 8. is safer and creates less pollution
Down
  1. 1. means of transport uses animal energy
  2. 2. most expensive mode of transport
  3. 3. invented the first locomotive engine
  4. 5. passenger train