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Post by jakeloyst on Oct 20, 2017 19:21:28 GMT -5
I know the gp7/9 all have a center drop frame, thanks mounts the fuel tank, etc, did EMD continue this same style frame onto the GP30 and GP35? Anyone have photos? thanks
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Post by big train james on Oct 20, 2017 20:30:13 GMT -5
The drop frame was used until part way through the production of the gp35's. Trainiax has a nice breakdown of locomotive phases that talks about this.
I have a picture here somewhere of a derailed Santa Fe gp35 with a flat frame. I think it's from rrpicturearchives.net. I'll see if I can find it. But even if I do, I don't currently have a photo host set up now that I closed my photobucket account. Either I'll find the link to rrpicturearchive.net or maybe I can email it to you. Let me see if I can find it.
Jim
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Post by big train james on Oct 20, 2017 20:32:32 GMT -5
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Post by jakeloyst on Oct 21, 2017 20:37:26 GMT -5
thank you very much
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Post by big train james on Oct 22, 2017 19:38:45 GMT -5
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Oct 22, 2017 21:00:36 GMT -5
There is also two bolster lengths of fish belly frames. GP30’s through to GP35’s up to June of ‘65 had fish belly frames with the rear bolster moved 2’ back. The frame length remained the same. Only the bolster spacing changed. Mainly for larger fuel tanks.
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Oct 23, 2017 9:32:25 GMT -5
The GP7 through GP20 used the same frame. The same frame construction was used on the GP30 and GP35 through phase Id with the exception of the rear bolster being moved rearward 1' (not 2'). The fish belly was also moved rearward 1' to accommodate the larger fuel tank.
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Post by jakeloyst on Oct 25, 2017 20:24:29 GMT -5
thanks for the info, any chance there are any photos or drawings around ??
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Oct 26, 2017 23:00:21 GMT -5
You’re right Brian. It is only one foot back. I haven’t touched anything of mine in months. I guess my knowledge is fading a bit too lol. The diesel locomotive encyclopedia has drawings of these geeps in HO. Both frame versions can be seen in the drawings.
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Post by big train james on Oct 31, 2017 8:29:44 GMT -5
thanks for the info, any chance there are any photos or drawings around ?? There is a gp35 frame assembly drawing on the CPTracks website. You will need to create an account to get access to the documents. It's for the drop frame version - no idea whether early or late regarding rear bolster position. Jim |
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Post by trainiax on Nov 11, 2017 20:34:25 GMT -5
The GP35 frame assembly diagram on the CPTracks site illustrates the "fishbelly" design, which was used on early GP35's and all GP30's. The underframe in my drawings of the GP30 and GP35 (on the Trainiax site) are based on this diagram.
All GP28, GP30 and GP35 production used the same 32' bolster centers, 52' frame length and 56' 2" overall length, with the rear truck 1' closer to the pilot than the front. The straight frame used on the late (Phase 2) GP35 kept the same length and truck centers, but used narrower side sills, taller/narrower steps, and a roughly 1.5" higher walkway compared to earlier units. These characteristics and dimensions were largely carried over to the frame on the GP40 (which was 3' longer).
The GP7 through GP20 also used a 52' frame length, but with 31' bolster centers (even from each end) and a shorter middle section over the fuel tank. GP7 and very early GP9 units used cast coupler pockets; later ones were fabricated. Additionally, the sloped sections of the underframe (at either end of the fuel tank) followed the same slope as the side sills on the GP7 and GP9. On the GP18 and GP20, these sloped sections were lengthened and used a thicker bottom plate at a shallower slope, similar to the GP30-35.
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