Transport through time

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Across
  1. 3. waterways made by people that boars can travel on, for transporting people or goods
  2. 4. to guide something in the right direction
  3. 6. railway engines
  4. 8. to be protected from harm or injury
Down
  1. 1. the steady flow of water or air in one direction
  2. 2. goods carried by sea, air or road
  3. 5. to train a wild animal to listen to instructions
  4. 7. almost, but not exactly the same