Railway coupling and programmable logic controller: what they have in common

1. Step 1. Railway coupling — is part of — Diesel locomotive. A coupler to the train.
2. Step 2. Diesel locomotive — has part — Air brake. Air brakes.
3. Step 3. Air brake — evolved into — Anti-lock braking system (ABS). Anti-skid systems first appeared in aviation and on railways.
4. Step 4. Anti-lock braking system (ABS) — has part — Microprocessor. A control unit.
5. Step 5. Microprocessor — is part of — Programmable logic controller. A processor.

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