Electromagnet and steam locomotive: what they have in common

1. Step 1. Electromagnet — has part — Copper wire. A winding.
2. Step 2. Copper wire — is part of — Electric generator. Windings.
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.

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