The Prewar and Post War Streamliner locomotives all had Yellow and brown then gray (1941) color scheme they were jointly owned so when the new 900 numbering system was applied to all passenger diesels for Daily Streamliner start up in 1947/48 letter prefix's were applied after numbers, on 3 unit locomotives A for cabs, B or C for boosters, and if jointly owned a J after the first letter IE: C J on a booster. I have only seen one photo (maybe in Bill Kratville UP Streamliner book) of a post war C&N W E-7 painted in yellow , but lettered for Chicago & Northwestern. Apparently this did not last very long, the jointly owned locomotive sets (three units) were broken up and locos went to their owners by 1950. SP received the former SF 1 E-2 A Unit, painted it in daylight colors, then rebuilt it into the Famous "Queen Mary" an E-7 A several years after E-7 production had ended. Northwestern received the former LA 1 E-2 A do not know if it was repainted to yellow & green. In the 1954-55 time era Northwestern supplied to equalize mileage, green and yellow E-7's. Southern Pacific who was used ALCO PA's by then never allowed them to run through. Nate Goodman (Nato).