A dual drive system for driving a pair of parallel output shafts comprises a pair of idler shafts interposed between and mechanically coupled to the output shafts by a first gear train. An input shaft is aligned coaxially with and is rotatable independently of one of the idler shafts. The output shafts are driven at one speed by adjusting a clutch to directly couple the input shaft to the one idler shaft, and are driven at a second speed by adjusting the clutch to indirectly couple the input shaft to the one idler shaft via a second gear train and gears rotatable respectively on the input shaft and the one idler shaft.