Autopilot and steam locomotive: what they have in common

1. Step 1. Autopilot — uses — Feedback control. Holding a course by feedback.
2. Step 2. Feedback control — is used in — Anti-lock braking system (ABS). A controller watches for wheel slip.
3. Step 3. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
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.

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