Gas operation and steam locomotive: what they have in common

1. Step 1. Gas operation — is used in — Machine gun. Gas-operated machine guns.
2. Step 2. Machine gun — is part of — Tank. The Mark I’s machine guns.
3. Step 3. Tank — has part — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).
4. Step 4. Diesel engine — is part of — Diesel locomotive. The diesel turns a generator.
5. Step 5. Diesel locomotive — evolved from — Steam locomotive. It replaced the steam locomotive.

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