Pressurized cabin and railway track: what they have in common

1. Step 1. Pressurized cabin — is part of — Jet airliner. A pressurized cabin.
2. Step 2. Jet airliner — evolved from — Aeroplane. A jet aircraft.
3. Step 3. Aeroplane — includes — Wright Flyer. The first aeroplane.
4. Step 4. Wright Flyer — uses — Railway track. The Flyer had no wheels: it took off along a wooden rail.

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