Diesel locomotive and electric fan: what they have in common

1. Step 1. Diesel locomotive — has part — Air brake. Air brakes.
2. Step 2. Air brake — has part — Compressor. A compressor pumps the air.
3. Step 3. Compressor — has part — Impeller. A centrifugal compressor is an impeller.
4. Step 4. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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