General arrangement diagram of Skoda diesel-electric railcar AC series for Soviet Railways Fig 6. Skoda diesel-electric railcar series AC undergoing test running at the Verlim Test Circuit Fig 8. Engine room of ... Thy- ristor convenors for a tension of 3 kV dc and an output of 1 500 kW have been tested for power and regenerative brake duties. Their use ... Smooth voltage control to the traction motors is obtained by impulse-width control at the three frequencies mentioned. No changeanbsp;...