Dynamic brake fans are direct current, higher horsepower (100). Cooling fans are 3 phase AC lower horsepower (60). Different fans , not interchangeable. Randy
I sw a 2 fan (gp38?) Version of a Herzog unit in Roseville maybe 6 months ago. It had a full cowl though.
Thanks for the info. As I said, I knew they weren't interchangable. Didn't know why. So againN not a q fan. Sure looks like a late 1st gen fan.
I realize this is a late reply to YoHo's photo of #2781, but maybe this will help. #2781 is a former AT&SF GP39-2 built in February, 1975. Originally road #3639, then AT&SF 3139, finally AT&SF 3412 before getting her current BNSF in February 2000. She was repainted into H3 orange and black on 4/8/2009. I could not find data on her fan, but she is not a rebuild.
A little late to this party but submitted for kicks anyway. While getting pictures of the Nebraska Zephyr, I stumbled on this very weathered BNSF, former AT&SF Evans Wide Vision Caboose. It really threw me off as the caboose was beside a station on former CB&Q track. To further confuse me, the TP&W go through town on former Santa Fe track, but looking at this main, I knew it wasn't TP&W. The TP&W still has jointed rail. I'm assuming the BNSF donated this former shoving platform to the town as it is on its own piece of display track. This would be an easy kit bash of an old Athern blue box or Atlas N and HO Evans caboose.
