Truck cab and electric motor: what they have in common

1. Step 1. Truck cab — is part of — Pickup truck. A cockpit.
2. Step 2. Pickup truck — is a kind of — Truck. A light truck.
3. Step 3. Truck — has part — Air brake. Air brakes, as on trains.
4. Step 4. Air brake — is part of — Diesel locomotive. Air brakes.
5. Step 5. Diesel locomotive — has part — Electric motor. Traction motors turn the wheels.

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