Railway track and computer: what they have in common

1. Step 1. Railway track — is used in — Metro. It runs on rails.
2. Step 2. Metro — uses — Tunnelling shield. Metro tunnels were built with shields.
3. Step 3. Tunnelling shield — uses — Hydraulic cylinder. The shield was pushed forward by jacks.
4. Step 4. Hydraulic cylinder — is part of — Flight simulator. A motion platform.
5. Step 5. Flight simulator — uses — Computer. Modern simulators are computer-based.

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