Here's an early 1990s pic of IC #6740, a former BN SD40-2.
http://www.locophotos.com/PhotoDetails.php?PhotoID=116559
Judging by the oxide-red covering on top of the long hood, it looks like IC #6740 used to have dynamic brakes. I guess IC removed it since all BN SD40-2s had dynamic brakes. I find it interesting IC continued to remove dynamic brakes from acquired EMDs into the early 90s, even though by that time all brand-new production EMD and GE freight locos had dynamic brakes. I guess IC didn't utilize locos with dynamic brakes until they bought brand-new spartan-cab SD70s in the mid 1990s.
Hadn't seen one of those in awhile. They were regular visitors on the Edgewood Cut-off (Bluford-Fulton) in the early 90's. Don't know about the brakes.
I believe that the second order of GP40's (3040-3059?) delivered around 1969 were equipped with dynamic brakes.
The IC's order of GP38ACs 9500 - 9519 were equipped with dynamic brakes from new, as were the SD40A locomotives 6007 - 6023.
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