Hi,
The proposed ACE 3000 came in several variations - 4-8-2, 4-8-4, 4-10-2 and a 4-8-2+2-8-4 NON-Garratt variation. Additionall there was a 2-8-0+0-8-2 Garratt variant.
ACE-3000
ACE-3000 "Dash 8" (second variant)
To answer Burlington Northern's request for an efficient drag-freight engine for use on unit coal trains, ACE later proposed an ACE 3000-8 variant, with driven wheels under both the boiler and tender, producing a 4-8-4+4-8-4 wheel arrangement. A separate frame was slung between the two units supporting the coal packs. This locomotive would have had greatly increased starting tractive effort and would have developed maximum horsepower at lower speeds. The ACE patent mentions that two alternative schemes were being considered: one with 4 high pressure cylinders on one unit and 4 low pressure cylinders on the other unit, the alternative arrangement having two engines each comprised of two high pressure and two low pressure cylinders.
ACE Mark 1-B (also known as the ACE 6000)
ACE 6000-G (Garratt Configuration)
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www.trainweb.org]
Doug vV