Supersonic air intake and railway track: what they have in common

1. Step 1. Supersonic air intake — is part of — Ramjet. It slows the oncoming flow and compresses the air.
2. Step 2. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
3. Step 3. Compressed air — is used in — Air brake. The brake is controlled by air pressure in the train pipe.
4. Step 4. Air brake — is part of — Diesel locomotive. Air brakes.
5. Step 5. Diesel locomotive — evolved from — Steam locomotive. It replaced the steam locomotive.
6. Step 6. Steam locomotive — uses — Railway track. It runs on rails.

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