Electric locomotive and watt steam engine: what they have in common

1. Step 1. Electric locomotive — has part — Railway coupling. An electric locomotive pulls its wagons through a coupling.
2. Step 2. Railway coupling — is part of — Steam locomotive. A locomotive hooks up its wagons with a coupling.
3. Step 3. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.

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