Four-wheel drive und tunnelling shield: was sie gemeinsam haben

1. Schritt 1. Four-wheel drive — nutzt — Achse. Four-wheel drive sends engine power to both axles, front and rear.
2. Schritt 2. Achse — ist Teil von — Wheelset. A common axle.
3. Schritt 3. Wheelset — ist Teil von — Bogie. The bogie carries the wheelsets.
4. Schritt 4. Bogie — ist Teil von — Elektrolokomotive. Bogies.
5. Schritt 5. Elektrolokomotive — wird verwendet in — Metro. The first lines were steam-operated; electric trains since 1890.
6. Schritt 6. Metro — nutzt — Tunnelling shield. Metro tunnels were built with shields.

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