Inner metal foil lining and railway track: what they have in common

1. Step 1. Inner metal foil lining — is part of — Leyden jar. Foil or water inside.
2. Step 2. Leyden jar — evolved into — Capacitor. The Leyden jar was the first capacitor.
3. Step 3. Capacitor — is made of — Tin. The plates are made of tin foil.
4. Step 4. Tin — is material for — Model railway. The first models were tinplate.
5. Step 5. Model railway — uses — Railway track. It runs on rails.

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