SBB Ae 3/6 series

The SBB Ae 3/6 is a series of electrical locomotives designed for both freight and passenger service on Swiss lowland railways. The series comprises three separate models: the Ae 3/6I, the Ae 3/6II, and the Ae 3/6III. They were constructed in lots between 1920 and 1929. They were the most numerous series of SBB locomotives constructed, and operated for around 70 years until the last units retired in 1994. The individual members of the series differ in how they are driven: the Ae 3/6I and Ae 3/6III by motors on each powered axle, and the Ae 3/6II by two motors connected to the center drive axle with countershafts, and then with rods to the other two driven axles. The asymmetrical undriven axle arrangement is due to the main transformer needing to be displaced to the front of the locomotive from the center of the body by the large traction motors located there.

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