Hello, Freight Train!

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Across
  1. 2. / We watch as we □□□□.
  2. 4. / Lights flash and bells □□□□.
  3. 6. / Tank cars for □□□.
  4. 7. / The last car's light □□□□□s from the back.
  5. 8. / Refrigerator cars where food won't □□□□□.
Down
  1. 1. / Down, down goes the □□□□.
  2. 3. / The train rolls away, far down the □□□□□.
  3. 5. / It pulls all the cars that □□□□□□ along.
  4. 7. / The engine is first, so □□□□ and so strong.