Model railway and saw: what they have in common

1. Step 1. Model railway — works like — Steam locomotive. A model.
2. Step 2. Steam locomotive — has part — Crank. Connecting rods and cranks carry the piston stroke to the wheels.
3. Step 3. Crank — is part of — Sawmill. A crank turns the wheel’s rotation into the stroke of the saw.
4. Step 4. Sawmill — uses — Saw. The cutting tool is a saw.

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