In comparison to the prior generation of DMUs, which typically used a pair of engines for each power car, the new generation DMU would only use a single engine per car; sufficient cooling was also provided that even with one failed engine, a two-car unit could continue to perform typical services without incurring a major performance deficient.
The text describes a significant improvement in the design of DMUs (Diesel Multiple Units), specifically highlighting their ability to continue operating even if one of the engines fails. This is achieved through improved cooling systems and a single engine per car configuration.