EMD SD40's

Discussion in 'Getting Started' started by artur_p, Feb 19, 2007.

  1. artur_p

    artur_p New Member

    Hi guys, I was just wondering what is the difference if any between the SD40-2 and SD40-3?
  2. alexbnfan

    alexbnfan Member

    I think that a SD40-3 is an after market rebuild/upgrade of a SD40-2

    maybe someone more knowldegeable will be able to tell you more???
  3. CRed

    CRed Member

    The DM&IR has quite a few of them and all of them except two are SD40-2's on SD45 chassis' with some minor differences.Here's an example of one....


  4. artur_p

    artur_p New Member

    what would this one be? it's says it's an SD40-3 but I think this looks more like an SD40.
    the reason I would like to know is because I will be building one in HO scale. Thanks.
  5. Thoroughbreed

    Thoroughbreed Member

    Chris, the one you have pictured is a tunnel motor, an SD40T-2.
    The CN SD40's listed in the bottom picture has a larger porch than a standard SD40. They have the "Ears" behind the cabs, for snow reasons, if I'm correct.
  6. UP SD40-2

    UP SD40-2 Senior Member

    CRed, the engine you posted is REALLY a SD45-T2:thumb:.

    Art, the engine on the point you posted is a plain SD40, lack of the water sight glass says its NOT an SD40-2. the overhang behind the cab is common on Canadian engines, though i don't know what it is:oops:.

    sorry folks, not sure just what makes an SD40-3....:oops:

    :D -Deano

    edit: sorry Thoroughbreed, was writing when you posted.
  7. CRed

    CRed Member

    On their roster they are listed as SD40-3's and they use SD45-T2 bodies so I read it wrong,sorry about that.


  8. UP SD40-2

    UP SD40-2 Senior Member

    Chris, NO NEED to apologize:thumb:. :D -Deano
  9. CRed

    CRed Member

    Hey Deano,look at the bottom of the page at the C-630's,I think the scheme will look very familiar to you:thumb:.
  10. UP SD40-2

    UP SD40-2 Senior Member

    Chris, THANKS FOR THE LINK!!!!:thumb: the link was GREAT! seems your right!!! AND, an SD40-3 means the prime mover has 3000hp!!! i learned something new!!!! thanks Chris!!!!!:thumb: :thumb: :thumb: hey folks, I'm an engine "nut", NOT an engine expert!tooth1 :D -Deano
  11. UP SD40-2

    UP SD40-2 Senior Member

    UP says it all!!!:thumb: :thumb: :thumb: :D THANKS AGAIN CHRIS!!!:D :D -Deano
  12. CRed

    CRed Member

    No problem Deano,it's a great reference!

    I'm no expert either,I just enjoy looking at engines,especially the DM&IR!!!

    Athearn has a RTR model of the SD40-3,but they call them SD45-T2/Early which isn't exactly correct.I wouldn't mind getting one and detailing it and adding DCC and sound to it.

  13. UP SD40-2

    UP SD40-2 Senior Member

    Chris, i have two of Athearns SD45-T2's, one patched SP, one UP. i have put MRC Brilliance decoders in BOTH, and they run & sound GREAT!:thumb: i didn't check if DM&IR had any SD40-T2's, but i have a patched SP one of those too(with Brilliance sound in it), its an Athearn BB. :D -Deano
  14. Pete

    Pete Member

    Snow shields. They are intended to minimize the amount of snow that gets sucked into the air filter media during snowy weather.
  15. UP SD40-2

    UP SD40-2 Senior Member

    THANKS PETE!!!:D Well, that makes three things i learned today on the same thread, i'm going to call it a good day!:thumb: :D -Deano
  16. Triplex

    Triplex Active Member

    I believe a -3 designation means a microprocessor refit. SD40-3s have been rebuilt from SD40s, SD40-2s, SD45s, SD45T-2s and maybe other models. I don't know any way to identify the -3 versions.
  17. CRed

    CRed Member

    Cool,I am thinking of putting one in my BN Kato SD70Mac.I don't really want to spend alot of money on one and if the MRC is good enough for you it should be good enough for me.

    Question though,what are the two loose wire for?Are they grounds or something?

  18. UP SD40-2

    UP SD40-2 Senior Member

    Chris:wave:, the MRC Brilliance sound decoders DON'T have ANY loose wires;). on decoders that do, they are usually for lighting effects. :D -Deano
  19. CRed

    CRed Member


    Strange,the one I saw on E-Bay shows two loose wires coming from the decoder.Would it be too much trouble to get the part number of the ones you use?I just want to get the right one so if you could I'd greatly appreciate it.

  20. UP SD40-2

    UP SD40-2 Senior Member

    Chris, the "older" MRC brilliance sound decoders had the two "extra" wires, as i mentioned before, they are for lighting effects. you can seal the ends to keep from getting a short, if you get one of those. the NEW MRC Brilliance decoders have all the wires included in the plug, and are MUCH SMALLER, making them A LOT EASIER to install as they require less room:thumb:. for an SD70MAC I recommend getting MRC Brilliance #0001638 EMD modern large diesel sound decoder:thumb:. Hope this helps:thumb:. :D-Deano

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