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Post by simulatortrain on Dec 11, 2015 5:44:47 GMT -5
Neat build! I have some SD39-2s on my roster as well, so I'll have to watch what you're doing. Mine would either be phase Ia or Ib according to what you have listed.
(not sure why this text is in a box)
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Dec 11, 2015 23:47:47 GMT -5
Lets see, KCS's SD40X units were built in 9/79. So the EMD car body with the dynamics behind the cab and on the current 68'10" frame was introduced almost a year befor the GP39X which came in 11/80. NW's SD50s models came a month later in 12/80. They also were built on 68'10" frames. Based on this I'm thinking any SD39X or 39-2 phaseIII would built at least 11/80 and after or even 5/80 like when the first GP50's rolled out introducing that car body. The SD39X/39-2 PIII would have a good year of probable production on the 68'10" frame also as the first standard 71'2" framed SD50's arrived on the KCS in 5/81. Since the dynamics behind the cab had already been around when the GP39X's were built its a good hunch they would show up on the SD39X/39-2 PIII too.
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Post by SD39dash2 on Dec 28, 2015 23:26:40 GMT -5
Based on how EMD built their locomotives in the 40 series, the Dash 2 version would share the 68' 10" frame with the SD40-2 and SD38-2 as a special frame length would have been deemed impractical. As I understand it, they tried it with the SD38s, making them a touch shorter than the SD39s and 40s. As far as late Phase 3s are concerned, I'm going with the idea that nothing as significant as making it look like an SD50 would have been done for standard production units, similar to the SD40-2. I think the new designs would have been saved for the 50 series.
Also, I'm not using a shorter air intake on the early units, but they might show up in the later phases. I'll have to study it a bit more. The stock Athearn clean air rooms on my first three are kind of holding the rest of the body geometry together, so I don't want to mess with them.
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Dec 29, 2015 21:26:24 GMT -5
The 50 series styling of the GP39X/PIII 39-2/49 is the just that. The "significant" part. None of those models were built before the 50 series was introduced. That's why they have 50 series radiator characteristics etc because they actually are 50 series evolution units. One will never know for sure though so its up to our imaginations at this point. As far as the inertial filter grills go, I suggest the changes due to the prototype being changed as well. 16cyl 38/40 series used one (longer) length while 12cyl. 39's were always shorter. That goes for the GP39-2's also. 38-2/40-2 SD or GP were all one longer size while GP39-2's were of the shorter design. Even straight SD39's used the shorter type same as the GP39's.
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Post by SD39dash2 on Jan 5, 2016 2:06:07 GMT -5
I tend to regard the GP39X/GP49 as something of an odd duck vs. the other forms of GP39-2. In any case, the D&NO fleet will be sticking to the classic porched look of the other dash 2s until the SD49s are built. To my way of thinking, anything else would defeat the purpose of making SD39-2s (and freelancing a railroad to purchase them).
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Jan 5, 2016 22:14:17 GMT -5
Anything is plausible lol. I wish we just had one SD example to go from and the puzzle pieces would fall together from there lol. If you go the SD40-2 car body style would you use the GP39x/49 long hood on it? I like that idea for simplicity. It's the clean air room length you'll have to fiddle with but its still will produce the overall (generic look) It's interesting to note that the first example of the larger style "50 series" radiator section came in GP form & length, on and SD!
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Post by SD39dash2 on Jan 14, 2016 0:11:01 GMT -5
I had a thought about why the GPs shared a little more crossover than the SDs as far as making a 39 look like a 50 or whatever; the geeps pretty much shared the same basic bedplate from the GP40 until the GP60 (with the GP60Ms being a bit longer, I think). With that in mind, you could really make a geep out of a wider range of carbody components regardless of the HP rating and model number.
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deez
Chairman
Midland Belt Railway
Posts: 949
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Post by deez on Jan 14, 2016 19:59:21 GMT -5
EMD was the best at making their diesels modular. The GP is probably the best example of that. The thinking process I have is that a model like the 39-2, as it goes through its phases even its design progresses into the latest car body style. Or the latest series. The SD version could very well do this also. The GP39 series can really be the greatest example of EMD car body change too. The monkey wrench in the whole progression is the fact that the 40-2 was so darn tried and true that EMD still received orders for them up to 1986! The 39 series is also a medium horsepower 12cyl turbo setup so who knows what EMD car body they would have chosen after 1980 lol.
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