Winch drum and electric generator: what they have in common

1. Step 1. Winch drum — is part of — Windlass. A cylinder on which the rope is wound.
2. Step 2. Windlass — uses — Crank. The handle of a windlass is a crank.
3. Step 3. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
4. Step 4. Steam locomotive — evolved into — Diesel locomotive. It replaced the steam locomotive.
5. Step 5. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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