Busbar ribbons and railway track: what they have in common

1. Step 1. Busbar ribbons — is part of — Solar panel. They collect current from the cells.
2. Step 2. Solar panel — is a kind of — Electric generator. A solar panel also generates electricity — from light rather than rotation.
3. Step 3. Electric generator — is part of — Diesel locomotive. The generator powers the traction motors.
4. Step 4. Diesel locomotive — evolved from — Steam locomotive. It replaced the steam locomotive.
5. Step 5. Steam locomotive — uses — Railway track. It runs on rails.

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