Chisel and electric generator: what they have in common

1. Step 1. Chisel — is used in — Tunnel. Hezekiah’s Tunnel was cut by hand with chisels.
2. Step 2. Tunnel — is used in — Metro. Tunnels.
3. Step 3. Metro — uses — Electric locomotive. The first lines were steam-operated; electric trains since 1890.
4. Step 4. Electric locomotive — has part — Railway coupling. An electric locomotive pulls its wagons through a coupling.
5. Step 5. Railway coupling — is part of — Diesel locomotive. A coupler to the train.
6. Step 6. Diesel locomotive — has part — Electric generator. The generator powers the traction motors.

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