Multistage rocket and steam locomotive: what they have in common

1. Step 1. Multistage rocket — is made of — Kerosene. The fuel is kerosene.
2. Step 2. Kerosene — is used in — Ramjet. The fuel is kerosene.
3. Step 3. Ramjet — uses — Compressed air. The air is compressed by the oncoming flow.
4. Step 4. Compressed air — is used in — Air brake. The brake is controlled by air pressure in the train pipe.
5. Step 5. Air brake — is part of — Diesel locomotive. Air brakes.
6. Step 6. Diesel locomotive — evolved from — Steam locomotive. It replaced the steam locomotive.

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