Wooden yoke beam and railway track: what they have in common

1. Step 1. Wooden yoke beam — is part of — Yoke. A crossbeam across the necks of two oxen.
2. Step 2. Yoke — is a kind of — Horse collar. A harness for oxen.
3. Step 3. Horse collar — is used in — Cart. The horse collar let horses pull heavy carts.
4. Step 4. Cart — is part of — Wagonway. Wagons rolled on the rails.
5. Step 5. Wagonway — evolved into — Railway track. Cast-iron and steel rails replaced wooden ones.

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