Thanks guys. I’m busy now, but I’ll do some more research and update the list this weekend. In the meantime, keep up the good work!
Just a wild thought. EMD produced FL-9 through 1960 and E-9’s through to 1964. And at the same time the SD-24. Could they have produced on an FP-9 frame a locomotive with a 567D3 engine. Thx IGN
This will be a series of postings, following research of prior postings, as I have time to do it today.
So far:
U25BG
C636PB
U33CG
U18C is not, as it was built as an export model, in a couple of generations.
The MK series:
MK6000AC
MK5000AC
The MK6000AC seems to have come from the MK5000AC:
Can’t find anything about an AC7100CW…
Navigating Google Books:
The SD55 seems to be offered, and essentially be a production SD45X, but apparently not offered in the -2 catalogue. This is 210HP/Cylinder, 15 less than the later SD50, and considering the issues with them, it is probably a good thing that EMD decided to drop this model.
Scroll down to Railfan & Railroad magazine: https://www.google.com/search?tbm=bks&hl=en&q=EMD+SD55
I had mentioned the SW750 as never offered, but I found this:
Any thoughts?
They’re very different looking beast from what we can picture a domestic U18C looking like though which would’ve been 6-7’ longer most likely with CC trucks being the prime visual difference but otherwise with an extremely similar family appearance to the U18B and other domestic U-Boats from that era.
So I’m not entirely sure that excluding that as a not produced model is exactly accurate just because they share a model designation with members of GE’s export line. But it’s obviously your call. 
Leo Ames,
I think I will include that, with a caveat mentioning that it would be an extension of the domestic U18B.
Updated List
GE
B18-7
U25BG
U18C-North American extension of the U18B
U56
U18BT
U15BT
U33CG
B40-8(B)
C23-7
B28-7
C28-7
B23-8
EMD
DD40A
SD55
AMT-125
RB3600
GMDH-2
SD40-2B
GP2000
SD39-2
SDL39-2
SD59
SD49
TR12
F45B
TR9
M-K
MK5000AC
MK6000AC
F-M
CFA-24
CFB-24
CPB-20
CPB-24
ALCO
PA-3
FA-4
C428
C620
C624
C636F
C636P(A)
C636PB
C650DH
RSD-33
Railpower
RP20BH
Ingalls
3-S
16-S
5-S
17A
MLW
RSC-23
RS-13
RS-24
Bombardier
HR416
HR618
HR406
Lima
800 HP BB road switcher
1600 HP center cab C-C road switcher/transfer
2400 HP center cab C-C road switcher/transfer
3200 HP CC cab unit powered by 6 free piston generators powering a turbine.
1600 HP Switcher Combo
2400HP Switcher Combo
Baldwin
1000 HP C-C Road Switcher
1500 HP C-C Road Transfer (streamlined car body)
3000 HP A1A-A1A Road Locomotive
Now,
Model designations for GE export models in the Universal series often overlap with domestic models and GE was known for recycling model designations for different models. Export U18’s were quite different from domestic U18’s.
I have serious doubts about any C436 or any C650DH. Does someone actually have paperwork to support the existence of specifications or announcements for these models? Speculative discussions among railfans don’t count any more than speculative discussions among design engineers - neither resulting in issuance of a specification or announcement of a model available for order.
In order, I believe, for any historian to accurately list a “model never built,” he must have an announcement of the model’s availability in a trade publication (NOT a railfan publication - unless the piece is a press release) or a specification sheet / folder issued by the manufacturer. It is our job not to write, and certainly not to re-write, but to represent history. I see a good deal of shaking out happening with the models identified in the list - many are known widely in manufacturer materials (the C-428 having been listed in ALCO operators’ manuals for a number of years) and I hope that the rest are properly vetted this way.
Now to an area where much more evidence exists… I’ve been collecting early GE information for many years, and frankly the U25BG model is just a figment of someone’s imagination. There was no such model number listed, advertised or described in specification by GE.
None of the following original GE sales material delineates any U25BG model:
“Investment in Railroad Progress.” GEA-6911, 2/60
“New Mainline Motive Power from General Electric.” Magazine insert, dated 1960.
“General Electric’s New Diesel-Electric Locomotive - the U25B.” GEA-7183, 5/61
General Electric U25B Diesel-Electric Locomotive 2500 Horsepower Specification 3030C, 1/62. (No train heating option listed under “Modifications.”)
“General Electric Locomotives - A Complete Line of Diesel-Electrics for America’s Railroads.” (Covers U25B, U25C, U50
Mr. Davis, thank you very much for your time spent researching and finding information on these proposals. I also wish this to be factually accurate, and to represent history as it actually exists. So thank you. I will be making edits to the list, and reposting it soon. Any more information would be greatly appreciated.
Latest List
GE
B18-7
U33CG
U18C-North American extension of the U18B
U56
U18BT
U15BT
U33CG
B40-8(B)
C23-7
B28-7
C28-7
B23-8
EMD
DD40A
SD55
AMT-125
RB3600
GMDH-2
SD40-2B
GP2000
SD39-2
SDL39-2
SD59
SD49
TR12
F45B
TR9
M-K
MK5000AC
MK6000AC
F-M
CFA-24
CFB-24
CPB-20
CPB-24
ALCO
PA-3
FA-4
C428
C620
C624
C636F
C636P(A)
C636P(B)
C650DH
RSD-33
Railpower
RP20BH
Ingalls
3-S
16-S
5-S
17A
MLW
RSC-23
RS-13
RS-24
Bombardier
HR416
HR618
HR406
Lima
800 HP BB road switcher
1600 HP center cab C-C road switcher/transfer
2400 HP center cab C-C road switcher/transfer
3200 HP CC cab unit powered by 6 free piston generators powering a turbine.
1600 HP Switcher Combo
2400HP Switcher Combo
Baldwin
1000 HP C-C Road Switcher
1500 HP C-C Road Transfer (streamlined car body)
3000 HP A1A-A1A Road Locomotive
I have the technical maual for proposed but never built Alco DH650. I was supposed to be a 5000 HP diesel hydraulic locomotive. It looks exactly like the DH643 which SP owned but with greater horsepower and trctive effort.
Interesting. When you say “technical manual,” what do you mean? Can you provide a photo of the cover and/or an ALCO publication number and date? I would not expect to see an Operator’s Manual or any Maintenance Manuals for a locomotive that was never built, so I am going to guess that the most you would have is an ALCO specification for the locomotive. Which if true would actually be very interesting! I had expressed doubt about the listed C-436 and this C650DH, and I will also add the listed C-660. I would like to compliment the original poster and caretaker of this string on his thoroughness and diligence. The result of this work will be some known and some interesting “could have been” locomotives that to me are far more interesting than “imagineered” locomotives. I looked through the updated list and am fairly sure GE actually offered 3300 HP locomotives in the 1977 or “Dash 7” series … but I will look for at least one concrete GE reference before suggesting you add these models. -Will Davis
Here is the cover sheet from the specifications manual for the Alco DH650
Well, this didn’t take too long.
General Electric publication GEA-10016, entitled “1977 Series Locomotive - A New Industry Standard,” and which was published 11/76 (1000 copies) gives details on the line as first announced.
The line included the following models, grouped together due to commonalities of engine and/or frame/body.
B18-7
B23-7
B28-7
B30-7
B33-7
B36-7
C23-7
C28-7
C30-7
C33-7
C36-7
Most know this, but the 1800 HP units were eight cylinder engines, the 23 and 28 series were 12 cylinder engines, and everything else 16 cylinder engines. Of course the 28 series here has nothing to do with the previous, older U28 series which had 16 cylinder 7FDL-16C engines. The unbuilt 28 series units here provide an interesting early harbinger of the later 12 cylinder, 3000 HP GE units often delineated by a suffixed “A” (such as the C30-7A.)
It’s interesting but not at all surprising to note that there is no six axle, eight-cylinder 1800 HP unit listed.
There are six unbuilt models listed by this publication alone, some of which have been included in the list presently being developed and a couple which I believe are omitted.
For clarity the unbuilt models are B18-7, B28-7, B33-7, C23-7, C28-7, C33-7.
As most of us are aware, there were various but LATER additions to this line, either built or unbuilt. This is simply the line as it was originally conceived by GE and announced - note that the publication date is late in 1976.
AS AN ASIDE, and not to affect the list being generated at all… I’ve grabbed the only operating manual for the Dash 7 series that I have handy, which is GEJ-5729C published 5/79 and it’s interesting to note that the models listed do not include either of the 3300 HP models, but do include all of the other models listed in the announcement / advertising brochure GEA10016 discussed above. It might
I have seen an Alco Century series manual (covering the entire range of locomotives) which listed the C660.
That does not mean that very much design work was done on the model but Alco may just have been saying (to Union Pacific especially) ; “If you want to buy it, we can build it”…
Do you remember any details of the C-660? Physical arrangement? Engine or generator (alternator) model? Trucks? Length, or more importantly, weight?
I am in no way intending to insult anyone or begin a flame war here, but I must say that from a technical standpoint I find a purported ALCO Century 660 to be practically impossible. My reasons follow.
First, let me say that I have at hand an original ALCO Specification DL-855A / DL-856A for the ALCO Century 855 A & B. Unfortunately the publication has no publication number and no date, but then again many ALCO specifications don’t.
If we look at the 5500 HP Century 855 we find a locomotive weight listed of 528,000 lbs. That’s important, because at the time ALCO was in business it would have required two 16 cylinder engines to develop 6000 horsepower - the 12 cylinder 251 was never rated highly enough at that time to do it. (Even at the per cylinder rating of the 16-251F rated 3600 HP for traction the 12-251F comes out at 2700 HP for traction.) So the platform for a purported 6000 HP locomotive could not have been much shorter or smaller than the 855’s and would, above the running board, likely have been nearly the same weight (the tradeoff between losing the big GT-598 generator, and adding the GTA-9 alternator and rectifier panels would not have been significant in terms of percentage of overall weight, and would have bought little or no space.)
We could remove the weight of the span bolsters and four, two-axle trucks from the 855 and add back in the weight of the three axle trucks, but one would have to imagine a weight still around 500,000 lbs – way, way too heavy for any railroad anywhere in the world on six axles. This is still far, far above the weight of the ALCO DH-643 and the GE U50C, the heaviest six axle units of the early generation. If GE could only get down to, what, 417,000 lbs (and that’s my memory, not a quote!) or so wi
For those that are doubters as to existance of the Alco DH650 sepcification sheet. Send me an email at igoldber1@comcast.net and I will send you the entire document.
Ira Goldberg