Cipher rotors and railway track: what they have in common

1. Step 1. Cipher rotors — is part of — Cipher machine. Discs with cross wiring.
2. Step 2. Cipher machine — has part — Keyboard. A keyboard.
3. Step 3. Keyboard — is part of — Linotype. A keyboard.
4. Step 4. Linotype — uses — Tin. A line is cast from type metal (lead, tin, antimony).
5. Step 5. Tin — is material for — Model railway. The first models were tinplate.
6. Step 6. Model railway — uses — Railway track. It runs on rails.

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