Mineral wool and truck: what they have in common

1. Step 1. Mineral wool — is used in — Thermal insulation. Insulation material.
2. Step 2. Thermal insulation — is part of — Refrigerator car. An insulated body.
3. Step 3. Refrigerator car — has part — Bogie. Bogies.
4. Step 4. Bogie — is part of — Diesel locomotive. Bogies with wheelsets.
5. Step 5. Diesel locomotive — has part — Air brake. Air brakes.
6. Step 6. Air brake — is part of — Truck. Air brakes, as on trains.

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