Sewerage and electric motor: what they have in common

1. Step 1. Sewerage — is made of — Brick. The drains of Mohenjo-daro are lined with fired brick.
2. Step 2. Brick — is material for — Metro. The vaults of the first tunnels are brick.
3. Step 3. Metro — uses — Electric locomotive. The first lines were steam-operated; electric trains since 1890.
4. Step 4. Electric locomotive — has part — Electric motor. Traction motors.

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