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The T 669.0 (from 1988 designated series 770) is a Diesel electric locomotive of the former Czechoslovakian State Railways (CSD). In addition to the derivation of the series designation ЧМЭ3 ("Tschme3") for the export locomotives to the Soviet Union, the locomotives owe their nickname Cmelak (in German: Bumblebee) also to their driving noises. With approx. 8200 locomotives the Čmelak and its unique design belongs to the most-built locomotives of the world.