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In page Eschede train disaster:

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The ICE 1 trains were originally equipped with single-cast wheelsets, known as monobloc wheels. Once in service it soon became apparent that this design could, as a result of metal fatigue[citation needed] and uneven wear, result in resonance and vibration at cruising speed. Passengers noticed this particularly in the restaurant car, where there were reports of loud vibrations in the dinnerware and of glasses "creeping" across tables.