ICRR "Green Diamond" diesel locomotive. Early E unit. Wikipedia: EMD participated in the construction of motorized railcars, integrated streamliner train sets, and experimental locomotives in the 1930s. Most of these were short runs (one, two, or four units) that were used by a single railroad. The majority consisted of Winton prime movers and General Electric generating, control and transmission components inside a car body whose assembly was subcontracted to another manufacturer.