Stack of conical discs and railway track: what they have in common

1. Step 1. Stack of conical discs — is part of — Cream separator. A stack of conical discs speeds up separation.
2. Step 2. Cream separator — uses — Centrifugal effect. Separation by density.
3. Step 3. Centrifugal effect — is used in — Centrifugal governor. The weights spread apart as the speed rises.
4. Step 4. Centrifugal governor — is part of — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.
5. Step 5. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.
6. Step 6. Steam locomotive — uses — Railway track. It runs on rails.

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