Tin and electric generator: what they have in common

1. Step 1. Tin — is material for — Model railway. The first models were tinplate.
2. Step 2. Model railway — works like — Steam locomotive. A model.
3. Step 3. Steam locomotive — evolved into — Diesel locomotive. It replaced the steam locomotive.
4. Step 4. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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