EMD SD70 series official thread (EXCEPT for ACe version)

Discussion of Electro-Motive locomotive products and technology, past and present. Official web site can be found here: http://www.emdiesels.com/.

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DutchRailnut
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Post by DutchRailnut »

no they are AC traction, if
m is used for modified in locomotive designation its a small m as in RS3m or GP35m
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer. I am not a moderator.

CN_Hogger
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Post by CN_Hogger »

DutchRailnut wrote:no they are AC traction, if
m is used for modified in locomotive designation its a small m as in RS3m or GP35m
Not in the case of an SD70MAC, the M stands for the North American Safety Cab.

DutchRailnut
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Post by DutchRailnut »

as I said the capital M is not for modified , as that would have been a reguler m
If Conductors are in charge, why are they promoted to be Engineer???

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CN_Hogger
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Post by CN_Hogger »

DutchRailnut wrote:as I said the capital M is not for modified , as that would have been a reguler m
Why say anything about a lower case 'm' when nothing was questioned about it. BTW, you said nothing as to what a capital 'M' represented. But then again, I wouldn't expect much more out of a glorified bus driver. Let us frieght men answer the frieght questions bud. :P

DutchRailnut
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Post by DutchRailnut »

Your right about the glorified bus driver part, every week my check shows me how glorified we really are, it looks like its Canadian Dollars but lucky its just US $$$$

As far as answering, this is a railfan board and any railfan can or may answer if he/she knows part or entire answer, but if you want to censor please take it up with moderators.
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer. I am not a moderator.

SooLineRob
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Post by SooLineRob »

SD = EMD's designation for 6 powered axles, "Special Duty"
70 = EMD's "70 series" powerplant
M = EMD's designation for widebody/safety cab
AC = Alternating Current traction system

slchub
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Post by slchub »

Us glorified bus drivers are home in bed sooner!

:P

SantaFeGuy

Thanks, in particular for that detail SooLineRob, GE?

Post by SantaFeGuy »

Could you do the same for GE's nomenclature, like you did for EMD's.

CN_Hogger
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Re: Thanks, in particular for that detail SooLineRob, GE?

Post by CN_Hogger »

SantaFeGuy wrote:Could you do the same for GE's nomenclature, like you did for EMD's.
Sure, for example C44-9W

C = Six Wheel Trucks
44 = 4400 Horsepower
-9 = Dash 9 Series
W = North American Safety Cab

Or ES44AC

ES = Evolution Series
44 = 4400 Horsepower
AC = AC Traction

SantaFeGuy

Thanks

Post by SantaFeGuy »

This was great! The moderator should make this sticky. I know a lot of folks wonder, even railroad guys.

Peter Radanovic
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Post by Peter Radanovic »

Or, an AC6000CW, for example.

AC - alternating-current traction.

6000 - 6000 horsepower.

C - C-series trucks.

W - wide-nose cab.
I have to ride seven kilometers to get to my railfanning-spot... and other teens think they have it hard!

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MEC407
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Post by MEC407 »

Here are some more examples:

GP38-2
GP: "General Purpose" (two axles per truck)
38: has a 16-645 engine without turbo
-2: built after 1972, modular electrical system

F40PH
F: fully enclosed carbody
40: has a 16-645 engine with turbo
P: geared for passenger train duty
H: has HEP (head end power) capability

B23-7
B: two axles per truck
23: 2,300 horsepower (actually it's 2,250 but they round up)
-7: built after 1977, has upgrades and enhancements over the previous series

C424
C: Century Series
4: four axles
24: 2,400 horsepower

M420W
M: Montreal Locomotive Works
4: four axles
20: 2,000 horsepower
W: North American safety cab

HR616
HR: High Reliability
6: six axles
16: 16-cylinder engine
MEC407
Moderator:
Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
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Sir Ray
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Post by Sir Ray »

Regarding EMD nomemclature, since the 1980s the number of 6-axle SD locomotives produced has widely exceeded the number of 4-axle GP, so much so that any 'new' EMD 4 axle loco introduced now would be, by definition, a 'Special'.
Wonder if they can redefine SD to mean 'Six-axle, Dammit' or something, and GP...heck, have they made any GP series since the early 1990s GP60s? How long ago was the GP20D introduced, and have they sold any since?

And remember, SW did not originally mean SWitcher, it meant Six Hundred HP, Welded Frame... (hence the SC and NW/NC series)

CN_Hogger
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Post by CN_Hogger »

Sir Ray wrote:
And remember, SW did not originally mean SWitcher, it meant Six Hundred HP, Welded Frame... (hence the SC and NW/NC series)
I've never heard of SC or NC, what did the C signify, Cast Frame?

Sir Ray
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Post by Sir Ray »

CN_Hogger wrote:
Sir Ray wrote:
And remember, SW did not originally mean SWitcher, it meant Six Hundred HP, Welded Frame... (hence the SC and NW/NC series)
I've never heard of SC or NC, what did the C signify, Cast Frame?
Yes
SW = Six Hundred Welded frame
NW = Nine Hundred Welded frame
SC = Six Hundred Cast frame
NC = Nine Hundred Cast frame

The SW1 carried on in this tradition, but the SW7 was 1200HP...

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