Tensor processing unit and railway track: what they have in common

1. Step 1. Tensor processing unit — has part — Transistor. An array of multipliers built from transistors.
2. Step 2. Transistor — includes — IGBT. A power transistor.
3. Step 3. IGBT — is part of — Electric locomotive. Traction converters.
4. Step 4. Electric locomotive — is used in — Metro. The first lines were steam-operated; electric trains since 1890.
5. Step 5. Metro — uses — Railway track. It runs on rails.

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