Transportation

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