The Dongfeng diesel multiple unit, also known as the Dongfeng motor coach, and NM1, was a DMU of Ministry of Railways, and was also the first diesel-hydraulic power car and double deck passenger car of China, built by Qingdao Sifang in 1958. The train consisted two motors and four double deck trailers, and was designed for short, commuter services. Each motor has two DV12A high speed diesel engines, and has the SF2006-1 hydraulic transmission. As the set had numerous flaws, it never entered mass production, but the valuable experience gained in the design and manufacturing process was later applied to the DFH1 and , while the passenger cars designs were later further developed for double deck trains such as the NZJ.