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| I believe the "BL" in the model designation stood for "branch line", since the greatest need for visibility in spotting cars outside of the yard was on locals trundling down a branch line.The big complaint of the day was visibility for engineers to spot cars at sidings on road trains with the wide body and high nose of the F-units, so this was EMD's first streamlined solution before the more practical square body design of the GP7. I think their production was a short run as they quickly came out with the GP7. Otherwise, I think more railroads would have jumped on board with this unique design.| Posted by SES on November 19, 2019 |  | 
 
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| This photo is my favorite! Another great photo Tom this photo was the best one! 
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