Can anyone tell me why some of the ATSF GP60s have rounded dynamic brake housings while others have the regular boxy DB found on just about every other GP60?
I like the boxy dynamics on the GP60s. That’s one of the features that makes me like the GP60 so much. When I modeled my fleet of GP60s I bought after market dynamics for them so they would have the boxy version.
From Extra 2200 South issue 90, A-M-J 90, page 14,
“SP-SSW, the first railroad to buy GP60’s, in 1-88, took delivery of 9635-9664 7-10 / 89, its third order. There is no apparent change compared to earlier SP-SSW GP60’s except a new style dynamic brake housing (first seen on AT&SF 4020 6 / 89 ). Our sources tell us this change in appearance is superficial to save cost and doesn’t affect performance.”
AT&SF got 4000-4019 in 1988 and 4020-4039 in 1989, all built in London