In contrast with the conventional system of having sets of wheels on two bogies slung underneath each carriage, Eurostar trains (18 carriages between two driving units) run two carriages with a wheel bogie shared between them.
Vastandina traditsioonilisele süsteemile, kus iga vaguni all on kaks pöördvankrit, mille külge kinnituvad rattapaarid, on Eurostar - rongidel (mille kahe juhikabiini vahel on 18 vagunit) iga kahe vaguni peale üks pöördvanker.