Car body and electric generator: what they have in common

1. Step 1. Car body — includes — Monocoque. A kind of body.
2. Step 2. Monocoque — evolved from — Chassis frame. The body took over the role of the frame.
3. Step 3. Chassis frame — is part of — Truck. A body-on-frame design.
4. Step 4. Truck — has part — Air brake. Air brakes, as on trains.
5. Step 5. Air brake — is part of — Diesel locomotive. Air brakes.
6. Step 6. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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