Electrolytic capacitor and steam locomotive: what they have in common

1. Step 1. Electrolytic capacitor — is a kind of — Capacitor. A capacitor.
2. Step 2. Capacitor — is made of — Tin. The plates are made of tin foil.
3. Step 3. Tin — is material for — Model railway. The first models were tinplate.
4. Step 4. Model railway — works like — Steam locomotive. A model.

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