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C_2000 (7 posts)
Jul-24-01, 02:43 PM (EST) "Does anyone know..." what the difference between an SD40 and an SD40-2 is? And also, which one is modelled in MSTS? I've seen both references...photographs of prototypes seem to indicate the -2, but I'd like confirmation and clarification, please.Thanks,
~Chris Alert Edit | Reply | Reply With Quote | Top
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Subject Author Message Date ID RE: Does anyone know... bleuzzmann Jul-24-01 1 RE: Does anyone know... C_2000 Jul-24-01 2 RE: Does anyone know... chucksc Jul-24-01 3 RE: Does anyone know... chucksc Jul-24-01 4 RE: Does anyone know... Rail_Driver Jul-24-01 5 RE: Does anyone know... bleuzzmann Jul-24-01 6 RE: Does anyone know... plainsman Jul-28-01 8 RE: Does anyone know... C_2000 Jul-25-01 7 RE: Does anyone know... scand Jul-30-01 9 RE: Does anyone know... Rail_Driver Jul-30-01 10

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bleuzzmann (188 posts)
Jul-24-01, 04:55 PM (EST) 1. "RE: Does anyone know..." Chris, (and I'm probably gonna need correcting here...) if I recall the difference is that the SD40 had a 4 axle setup, the Dash-2's (the SD40-2) was a second generation loco that used a 6 axle setup. Additionally, the Dash 2's had the Type T bogies, or high traction 3 axle setups. There was also a change from 16 cylinders to a 20 cylinder engine sometime along in the variants producing 600 more horsepower. In the sim, the default loco is a very similar (to the SD40) GP38-2, and the AI or computer controlled freight hauler is the SD40-2. The clever programmers out there have now given us the ability to 'drive' the SD40-2 models also in the sim, so we've really got them all...GP38-2, SD40 and the SD40-2.bill
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C_2000 (7 posts)
Jul-24-01, 08:25 PM (EST) 2. "RE: Does anyone know..." Thanks, bill. Just wanted my suspicions confirmed.~Chris Remove | Alert Edit | Reply | Reply With Quote | Top
chucksc (35 posts)
Jul-24-01, 08:54 PM (EST) 3. "RE: Does anyone know..." Actually both the SD40 and the SD40-2 ( from the GM/EMD "Dash Two Series" ) both have 6 wheel trucks.... As I understand it the improvements from the SD40 to the Dash Two mainly center around improved electrical systems and modular, easier to maintain controlls..... Remove | Alert Edit | Reply | Reply With Quote | Top
chucksc (35 posts)
Jul-24-01, 08:56 PM (EST) 4. "RE: Does anyone know..." And to 4 wheel truck series is the GP40 which later was upgraded to a GP40-2 in the catalog..... Eg: SD (for Special Duty) had 6 wheel trucks and GP (for General Purpose ) had 4 wheel trucks... Remove | Alert Edit | Reply | Reply With Quote | Top
Rail_Driver (29 posts)
Jul-24-01, 08:59 PM (EST) 5. "RE: Does anyone know..." LAST EDITED ON Jul-24-01 AT 09:01 PM (EST)Bill:Yes you need correcting.The SD40/SD40-2 has always been a 6 axle locomotive. EMD locomotives that start with SD have 6 axles. If they start with GP they have 4 axles. In 1972 EMD introduced the Dash 2 line of locomotives. At that time most models in their catalog were converted to Dash 2 specs. The Dash 2 line incorporated modular electronics among many other refinements but the number of cylinders did not change on the SD40. They have always had 16 cylinders and 3000 horsepower.The SD40-2 frame is 8 feet longer than the original SD40. The carbody of both locomotives is about the same so because the SD40-2 frame is longer it has noticeable excess space on the walkways at the front and rear of the locomotive. Externally that is how you would tell the difference between a SD40 and a SD40-2.Also Bill the locomotive you are thinking about with 600 more horsepower (total of 3600) and 20 cylinders is the SD45. That locomotive does not look like an SD40 because the SD45 has flared or angled radiators.The locomotive in MSTS is the SD40-2. There is no SD40 in MSTS.Rail Driver
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bleuzzmann (188 posts)
Jul-24-01, 10:18 PM (EST) 6. "RE: Does anyone know..." Thanks Rail_Driver for the correction. I went back and checked on the 20 cylinder updates...that didn't come along until the SD45. What did change was the engine designations along the way...from the older 567 to the 645E and 645E3. bill
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plainsman (38 posts)
Jul-28-01, 01:03 AM (EST) 8. "RE: Does anyone know..." Actually, the 20 cylinder SD45 preceded the 16 cylinder SD40-2. SD45 production ceased about the end of 1971 and SD40-2 production began in early 1972. The crankshaft on the SD45 20 cylinder engine was not up to the task, and the SD45 quickly earned a "problem child" reputation. The SD40-2 out sold the SD45 by about 3 to 1. It was more reliable and more economical to maintain and operate. A few roads bought SD45-2 locomotives, but the reputation of the SD45 never let it's offspring gain widespread use. The 16 cylinder SD50 sealed the issue for years as it had almost as much horsepower out of 16 cylinders, and the wheelslip control allowed it to out pull a SD45 easily, and work under adverse conditions without sand ( or a lot less of it, nicer on the rails).
Bob Remove | Alert Edit | Reply | Reply With Quote | Top
C_2000 (7 posts)
Jul-25-01, 10:19 AM (EST) 7. "RE: Does anyone know..." Thanks again, bill, Rail, et al.I knew I'd get all the answer I needed, and more! ~Chris Remove | Alert Edit | Reply | Reply With Quote | Top
scand (37 posts)
Jul-30-01, 06:57 PM (EST) 9. "RE: Does anyone know..." The SD40's length was 65' 9 1/2" with the truck centers at 40.0'The SD40-2's were 68'10" with truck centers at 43'6".All the other information is correct.Alex
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Rail_Driver (29 posts)
Jul-30-01, 07:57 PM (EST) 10. "RE: Does anyone know..." Yes you are correct about the SD40/SD40-2 lengths. The original data that I looked at was for a UP prototype SD40 and that info gave the length at 60' 6". I believe there were some very early SD40 locomotives that were based on the GP40 but with 6 axles.Rail Driver
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