Footwear and railway track: what they have in common

1. Step 1. Footwear — is made of — Leather. Leather.
2. Step 2. Leather — is material for — Chariot. The floor was woven from leather straps.
3. Step 3. Chariot — evolved from — Cart. A chariot is a lightened cart.
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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