Churn lid with hole and electric generator: what they have in common

1. Step 1. Churn lid with hole — is part of — Butter churn. It lets the dasher’s shaft through.
2. Step 2. Butter churn — uses — Lever. A dasher.
3. Step 3. Lever — is used in — Railway coupling. It is locked with a lever.
4. Step 4. Railway coupling — is part of — Diesel locomotive. A coupler to the train.
5. Step 5. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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