Sintering and railway track: what they have in common

1. Step 1. Sintering — uses — Kiln. An oven.
2. Step 2. Kiln — has part — Chimney. The chimney creates a draught.
3. Step 3. Chimney — is part of — Steam locomotive. Smoke from the firebox leaves through the locomotive's chimney.
4. Step 4. Steam locomotive — uses — Railway track. It runs on rails.

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