 They were replaced by American Locomotive Company (ALCO) PA-1 cab units and PB-1 booster units and General Motors Electro-Motive Division (EMD) E7A cab units and E7B booster units diesel locomotives in two-shades of orange, later painted dark gray with red nose.EMD F7A cab units and F7B booster units.Originally painted black (described as "Black Widow") with silver nose and two-shades of orange stripes, later painted dark gray with red nose.