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| DRF-44 http://twincitiesrailfan.com/forums/viewtopic.php?f=2&t=1742 |
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| Author: | brahamfireman [ Sun Dec 14, 2008 1:43 pm ] |
| Post subject: | DRF-44 |
What does this mean. All the AC4400CW's have it as do the new ES44AC's. The SD40-2'S and the Geeps have different numbers, but same question to those also. |
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| Author: | Looney [ Sun Dec 14, 2008 3:01 pm ] |
| Post subject: | Re: DRF-44 |
I believe it means: D = Diesel R = Road F = Freight 44 = 4400 horses Hence the other units would have different numbers depending on the horse power. The old Milwaukee Road did a similar thing. Basically, I think it is the particular railroad's way of classing the units in their system for horsepower calculation when building a train. An example would be the SD40-2: it is 3000 horsepower, but nothing in the EMD model designation tells you that. So the railroad assigns or classes it as DRF-30. So everyone knows that it is a 3000 horse diesel unit, designed for the road versus the yard, with freight speed rating. Makes it quicker and easier to build a multiple consist that requires 12000 horsepower. |
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| Author: | brahamfireman [ Sun Dec 14, 2008 3:03 pm ] |
| Post subject: | Re: DRF-44 |
Makes sense, similar to the UP having to change the classifications of every loco also. |
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| Author: | Looney [ Sun Dec 14, 2008 3:11 pm ] |
| Post subject: | Re: DRF-44 |
I should have pointed out the Milwaukee's system was slightly different. An example of theirs is: 23-ERS-6 23 = 2300 horses E = Electrical R = Road S = Switcher 6 = 6 powered axles or a GP9 was 17.5-ERS An MP15 was 15-ES (no R, as it was basically designed for yard operation) They seemed left off the 4 for the axles on many SW and GP units for some reason |
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