The ET44C4's trucks are A-1-A, with the center axle unpowered. (The air cylinders and bell cranks outside the frame, which can be used to lower the weight on the idler axle so as to get more adhesive weight on the powered axles, are located in a way that suggests this, so I guess you could say that the wheel arrangement is -- almost -- visible.) EMD's bid for the four-out-of-six-axles-powered is, I think, a B1-1B unit-- don't ask me why. (Bogieman, can you explain the choice?)
Contemporary 4-axle passenger units are, it has long seemed to me, VERY heavy for passenger units, despite having a (more expensive but) lighter weight carbody design and much smaller fuel tanks than most modern freight units, so it seems reasonable that a 4-axle unit built to freight locomotive standards would be unacceptably heavy. The B40-8W (officially "Dash-8 40 B," but that style of writing model designations was not one of GE's better ideas!) was light enough to be used on the Santa Fe main line, but I think a modern version would have to be heavier: the GEVO-12 is, I think, a heavier engine than the FDL-16 (and the GEVO version used on ET4 units is probably somewhat heavier than the original version), the AC transmission is probably heavier (I think GE's AC traction motors are somewhat bigger than the DC 752 motor; internally both would have an alternator and a rectifier set and the AC locomotive adds the inverters), and the enlarged radiator and other features needed to meet Tier 4 pollution requirements are, in addition to their own weight, big enough that GE had to lengthen the locomotive platform to accommodate them.
Pity. Idler axles on a freight locomotive seem like an unfortunate design compromise, but if you want GE power for 4-axle units for fast freights (if, say, Warren Buffet gives BNSF to you, and you decide you want "Super C" timetables for intermodal trains on the Santa Fe main line), you'll have to pay extra to have them built with Genesis-style carbodies and fuel tenders. If you DO decide to spend your money this way... just a bit more and you can have them painted in Warbonnet colors!