Copper wire and plough: what they have in common

1. Step 1. Copper wire — is part of — Electric generator. Windings.
2. Step 2. Electric generator — is part of — Diesel locomotive. The generator powers the traction motors.
3. Step 3. Diesel locomotive — has part — Diesel engine. The diesel turns a generator.
4. Step 4. Diesel engine — is part of — Tractor. A diesel.
5. Step 5. Tractor — uses — Steel plough. Ploughing with a tractor.
6. Step 6. Steel plough — evolved from — Plough. A steel share.

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