I have an EMD Question.

[Anonymous]

This is in reguards to the NEW EMD SD70ACe & the SD70M-2.
What is the difference between the two?
Is the SD70ACe the same thing as an SD70MAC?
I know the HorsePower is still the same,But what about the length of these three Locomotives?
How does the SD70ACe differ from the SD70M-2?
Id like some thoughts to help me with all weard power that is already hitting the Market.
Thanks.

[M636C]

The two units SD70ACe and SD70M-2 look pretty much the same externally. The ACe has AC traction equipment, while the M-2 uses DC traction equipment.

EMD hasn't been very forthcoming with specifications, but the engine in both of these units is that from the SD75 and the SD90/43, a 16-710 producing 4300 HP at 950rpm, with some tier two modifications for emissions. Some later SD70MAC units were 4300HP, but the SD70M was only 4000 HP. So, in fact these are really "SD75"s not "SD70"s. I think EMD wanted to keep the "70" designation because they are so successful, but the new units are more powerful.

EMD have moved the heavy electrical gear to a box behind the cab on the left side of the unit (same place as GE put their AC inverters). This allows the unit to be shorter. The SD70MAC was longer than the SD70M, but that is no longer neccessary.

The SD70 ACe replaces the SD70MAC and the SD70M-2 replaces the SD70M.

Both new units have a smaller version (two fans, not three) of the wide radiators used on the SD90.

The cab is similar to the cab used on the latest (Phase II) SD 90, but looks slightly different around the headlights and illuminated number boards.

If you need other information, please ask

Peter

[dharmon]

Peter,

Your level of knowledge scares me sometimes....

[locomutt]

QUOTE: Originally posted by dharmon

Peter,

Your level of knowledge scares me sometimes....

Dan that's a [#ditto] from me also! I do well enough telling the difference
between a GP-7 and a GP-9.[:D]

[Anonymous]

Ya bet the Hell of it is,you ALL do a good job. Keep up the good work[^].
Thanks.

[daveklepper]

Thanks

[M636C]

Guys,

About twenty years ago I wrote a book on locomotives in the People's Republic of China.

Now that was a challenge! It's still the only technical book in English on the subject but is long out of print! I gave a copy of the manuscript to our military intelligence office, and they seemed pleased.

But with EMD, I'm just doing what their PR people should be doing!

Peter

[Anonymous]

Both the SD70ACe and SD70M-2 are 74' 3" long. Continuous tractive effort for the SD70ACe is said to be about 147,000 lbs. (some sources say 157,000), which is about 10,000 lbs. more than an SD70MAC. For the SD70M-2, CTE is about 113,000 lbs., which is about 4,000 more than an SD70M.

The SD70ACe has two horizontal grids/intakes that run across the AC inverters on the left behind the cab. The SD70M-2 lacks this feature. Its just a blank sheet of metal. Also the SD70ACe has an angular box directly above the AC inverters and has two extra handrail stanchions. Again, the SD70M-2 lacks these features. Also on the left side of the locomotive, the SD70ACe has two columns of three horizontal grilles/intakes located on the dynamic brake while the SD70M-2 does not. The right side of the locomotives are very similar and I cannot find any major detail differences.

[M636C]

Mike,

I had noticed the variation on the inverter covers of the SD70ACe compared to the SD70M-2, but not the other changes. GE AC units have three versus two fan cooled resistor units, so the extra grilles on the SD70ACe probably relects the additional capacity required.

The photos published via this forum showed pretty messy cabling on the SD70M-2, in my opinion, at least.

Peter

[dharmon]

QUOTE: Originally posted by M636C


The photos published via this forum showed pretty messy cabling on the SD70M-2, in my opinion, at least.

Peter

Raymond Loewy is doing somersaults in his grave....

[M636C]

Dan,

Yes, without needing to see the cabling, either! The combination of raised sandbox fillers and crudely cut-off nose angles would do that, without him having to consider detail like cabling!

Loewy liked colour schemes that enhanced the appearance - none of the recent EMD schemes do that. In that respect, how the mighty have fallen! The blue and white scheme on the 60 series was OK, The maroon silver and white was a bit over the top, but now, words fail me...

Peter

[dharmon]

I kind of expect it to stand up and transform into a large robot.....

[UPTRAIN]

I have EMD Spec. Sheets for both of these locomotives if there is something not already on this topic, let me know.

[Anonymous]

REGARDING THE HANGING CABLES ON THE NEW SD-70-2:
Every new EMD series that is built goes through a series of validation/performance tests either at LaGrange, Pueblo or actual testing on a customer's road. You may have noticed on the road test the engineering test car that follows a test locomotive. Well, those cables you see hanging underneath the electrical/software compartment are quick connect cables outlets. These quick connects allow for ease of attachment with the test cars telementry cables. As standard EMD practice for every model introduced.

T-TIME

[M636C]

I've run engineering tests on cars and locomotives, and those were very heavy cables for test purposes! You could use them to feed the traction motors! How many amps does the telemetry draw?

Peter

[Anonymous]

QUOTE: Originally posted by UPTRAIN

I have EMD Spec. Sheets for both of these locomotives if there is something not already on this topic, let me know.

I already gave up trying.