Great Northern GP-7 rooftop equipment identification help

[jguess733]

I'm modeling the Fort Worth and Denver in the early 70's. In 1972 BN sold the FWD four ex-GN GP-7's like the one pictured below.

http://www.rr-fallenflags.org/bn/fwd701abp.jpg

 

Since the FWD unit is marked as long hood front as per GN practice I guess I'll have to run then that way. Anyhow Here is a rooftop picture of FWD 702 from the GN days. 

http://www.rr-fallenflags.org/gn/gn0602cca.jpg 

 

So my questions are is that a winterization hatch around the second fan (I don't know which fans do what), and is that a stream generator up front err in the back?

I'm planning on using the Bachmann n scale GP-7 to model all four units. Unfortunately FWD 701 is the only unit I have a photo of. But the close enough approach is good enough for me.

[rrinker]

 Starting at the front (long hood) - 2 radiator fans (onw with winterization hatch), 2 exhaust stacks, 2 more radiator fans. On the short hood is a steam generator exhaust.

 In the later picture, looks like most of it is all intact except that the steam generator has been removed. Rules say that any equipment ont he lcomotive must be in working order, so if the unit was no longer used for passenger trains, the steam generator would be removed as one less thing to worry about maintaining to keep the loco operational.

                   --Randy

[gmpullman]

Jason,

I made the link to the 602 clickable.

http://www.rr-fallenflags.org/gn/gn0602cca.jpg 

The 602 does still have the steam generator. Larger dome right behind horn is the air intake and right behind it is the exhaust, about an 8" round flue.

Just behind the front headlight/Mars light is the sand fill hatch and to its left, behind the grab iron is the radiator fill pipe. That winterization hatch sure looks like a shop-made affair. Any of the EMD ones I've seen had radiused edges.

By the early '70s I'm certain the steam generators had been removed as Randy says. In the NYC geeps I've been in there was a huge concrete slug taking up the space where the Vapor steam generator was for added ballast.

Ed

[cv_acr]

That's a really early EMD hatch. Later ones had rounded edges and a square grill.

[jrbernier]

  The GN was an early user of winterization hatches, and EMD did make that one.  They also made some that had a bullit contour on the front(F Units).  The 'rules' varied, but the S/G was a 'boiler' and needed a monthly boiler inspection.  Disabling it was a quite common way to remove the inspection requirement.

  Safety equipment was another thing.  They had to be fixed or removed if not used.    The daily inspection on the CB&Q required that signal lamps(Mars lights) be in working order.  It was very common to have them grind up the gears, and was a never ending job.  No wonder they got replaced by the roof top beacons!

Jim

[jguess733]

Thank you all for the info. I actually stumbled upon all this by accident. I noticed awhile ago that the FWD unit was marked with long nose forward but couldn't figure out why none of the FWD's SD7's were. Non of the data I could drum up could give me any help torwards finding out when the FWD aquired these units. In a completly random post in another forum I saw that it was standard practice for the GN to do this. Which led me to the GN's Historical Society website and there was my answer. I think the research is my favorite part of this hobby. And again I want to thank you for helping find the answers I was looking for.