Cloud chamber and railway track: what they have in common

1. Step 1. Cloud chamber — has part — Piston. A sudden expansion supersaturates the vapour.
2. Step 2. Piston — is part of — Rock drill. A percussion piston.
3. Step 3. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
4. Step 4. Tunnel — is used in — Metro. Tunnels.
5. Step 5. Metro — uses — Railway track. It runs on rails.

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