Dean, I think that the loco in the first picture is from GMD (the Canadian counterpart of EMD). Check out the end of the long hood (very geep-looking), the two exhaust stacks, along with the radiator air intakes and the roof-top fans. Those three-axle trucks also look very similar to three-axle Flexicoils. The loco, by the way, is from the Newfoundland Railway, and is narrow gauge.
The little loco in the third picture is from MLW, ALCO's Canadian licensee. I don't have the book at hand to check the exact history, but these locos had several different trucks over their lifetime, including A-1-A, two axle GMD Flexicoils, and possibly ALCO/MLW Tri-Mounts, with three traction motors. I believe that they were rated at 1400 HP, but, as with the other info, don't quote me on that.
I just flipped back to your post on the new diorama and saw the last shot that you edited in. Very effective:thumb: :thumb:, and you didn't even have to go downstairs
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Wayne