QUOTE: Originally posted by SSW9389 How many miles did GE and GM put on the 6,000 horsepower units before production began? Back in the old days significant demonstrator tours were the order of the day before production of new units began.
-Don (Random stuff, mostly about trains - what else? http://blerfblog.blogspot.com/)
QUOTE: Originally posted by railpac Ok, so maybe we can't just drop a 16-710 into a SD40-2, however if we remanufactured (different from a rebuild) a SD40-2 with the right cooling systems, oil and fuel equipment, and computers, to the specifications of an SD70, it would be cheaper than a new SD70, or any new loco for that matter. The only drawback would be not being able to place the HT-R (i think thats the name) radial truck under the SD40-2, because the HT-C uses a different connection. Also, what about just dropping a 12-710 into a SD40-2, same horsepower, same electrical output, it wouldn't need much modifications to the existing systems, right?
QUOTE: Originally posted by oltmannd This is an interesting thread which raises a few questions. Is inverter technology still evolving/improving? Are the high power GTOs getting any better? Is the control system improving/evolving as microprocessor technology improves?
QUOTE: Originally posted by crblues i think that the sd40-2 will always outperform any of these new a.c. traction units any day. yeah, they may gulp a little more fuel, but you need PERFORMANCE in a railroad. the sd40-2 was, and still is the answer.
She who has no signature! cinscocom-tmw
QUOTE: Originally posted by Mookie Ok - that is clear enough. But freight back here is almost never behind an SD70 - always a Dash 9 or SD38 and SD40's. But then we haven't had a mountain here in just ages. I noticed this weekend, most of the freights were Dash 9's with SD's as helpers. I appreciate the explanation! Jen
QUOTE: Originally posted by Mookie A question from the curious one. Why would you need more horsepower when the SD70MAC with a unit on the head end and on the rear end, seems to move a lot of coal across Wyoming and Nebraska and on east. Is it because of mountains? I am trying to follow this, but it is a little over my head. Jen
QUOTE: Originally posted by jgfuller Very interesting insights from one who has built the locos! ACs have worked very well in heavy haul service -- the problems so far seem more with the diesel rather than the transmission. 6k HP is a lot in a mobile environment. So far as I know, UP doesn't use their 70s much in coal service. And the tractive effort advantages of ACs in general service may be offset by higher first cost. As many of those posting have noted, it's the reliability of the 40 that is important. The 70 does all that, in a newer package. I'd predict that in time the 70 will supplant the 40 as an icon of consistency. How have lower HP ACs fared, compared with the high HP models? Hooking up a 710 engine with an AC transmission and radial trucks sounds good -- I guess this would be an SD80MAC (or 70MAC), eh? UP shows having 300 SD9043ACs, with 4300 HP, but no other EMD ACs besides 62 6k HP models. And about 1000 GE 4k ACs, compared with 60 6k units. So this HP seems to work OK with either transmission. One had to wonder when EMD had to go to a 4-cycle design to get 6k HP -- good grief, an EMD that sounds like a GE!!
Jack Fuller
QUOTE: Originally posted by jgfuller Interesting that no one has mentioned SD70s. Big advantage I've seen is the radial truck. That, increased reliability, and better fuel economy would all be motivation to buy new SD70s, rather than rebuild 20-30 year old SD40s. Yes, they are new, but UP says the availability of their 1200 new SD70s is 96%. And they got these AFTER experiencing ACs of both builders. UP uses them in every type of road service. When SP got their 25, along with another 25 leased from EMD, the power delays at Roseville vanished! A fine locomotive.
QUOTE: Originally posted by drailed1999 The only major difference between a 645 and a 710 is the piston stroke is 1 inch longer which makes the engine 1 inch taller. All other engine dimentions are the same.
QUOTE: Originally posted by ironken Hey Dekemd, the GE primemover in the AC6000 is a different design. It is not a turned up FDL. If I remember right it was a Deutz design. Looking at the thing, it is very different, twin turbos, etc. I think that GE was involved in a lawsuit against Deutz for the crappy outcome of their design. I was on a CSX unit with the big motor and was surprised that it seemed not to vibrate as bad as the 4400. Maybe because it was derated to 4700 ponies, who knows. Ken
QUOTE: Originally posted by railpac Frankly, I'm suprised that we haven't seen any SD40-2 being rebuilt with 12-710Gs rated at 3000hp or 16-710Gs rated at 4000hp. I mean with a few modifications a 16-710G should drop right into the engine compartment of a SD40-2 essentially making it a SD70-2. Or just use a 12cyl model and drop it into the compartment with even less modifications (I'm guessing) to keep the horsepower the same. I say this because I have seen 16-567 replaced with a 16-645. And the original GP40X (the single GP40 test unit built on a GP35 frame) had a 3000hp 16-645E3 in the same space that a 16-567D3A would have occupied in a standard GP35. Any other thoughts on this subject?[:)][:D][8D][;)]
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