This 1-D-1 type was designed by Kalman Kando and produced from 1932 to 1937.
"The single-phase alternating current taken from the overhead line was converted into three-phase current by the phase converter and supplied to a single Metropolitan-Vickers traction motor which was a 48-pole asynchronous motor. The phase converter provided four fixed speeds (25,50,75 and 100 km/h) and intermediate speeds were obtained using a liquid rheostat."Final drive was through a Kandó triangle with one arm connected to an auxiliary idling shaft to minimise unwanted vertical forces. The locomotive was built on a rigid frame. Two of the driving axles had side play, which was controlled by Krauss-Helmholtz bogies."
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