It merged with Alstom of France in the late 1980s, then in 2003 was bought out by Siemens AG of Germany, now being called Siemens Industrial Turbomachinery.
Proizvodnja dizelskih motorjev se je prenesla iz Ruston Diesels Division v Newton-le-Willows, Lancashire GEC na nekdanjo Vulcan Foundry, ki je bil na koncu prodana nemškemu MAN Diesel (zdaj MAN Diesel & Turbo) v juniju 2000.