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Even the quietest modern DMU's are surprisingly noisey and have a degree of vibration. I remember reading in a magazine that this is one of the reasons that NR here are leaning towards proper power cars for the next generation of Intercity express sets, where the contract to investigate the options was only recently signed. There will be a DMU derivative but I think its going to be for fast commuter routes only, with the longer range and Bi-modal sets having power cars when diesels are used.
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