The TRAINOSE Class 520, also known as the AEG DE IC-2000N, is the oldest class of trainsets operated by TRAINOSE. They are diesel-powered, they can be DMU-5 or DMU-4 and were built in 1989 and 1995 as class 601 and 651, respectively, from the cooperation of West Germany's AEG and East Germany's LEW, and for about two decades they were the spearhead of the fast- interurban quality trains (InterCity). Sometimes, DMU-4 units circulate coupled with another truck. In total, there are 20 such trainsets, 12 DMU-4 and 8 DMU-5.