This is a very interesting shot looking straight down on a truck that, prior to a derailment in August, had been on BNSF 4272. I say it is interesting because it really demonstrates some of the mechanics of GE's ES44C4. The unit is a A1A-A1A unit, meaning only four of the six axles are powered. As you can see here, a traction motor is attached to the axle on the left, but the center axle is a "dummy" axle. The axle on the right, were it still intact, would also have a traction motor attached. You can also see some of the hydraulics that GE uses to slightly lift the center axle up when necessary to provide more tractive effort, the weight resting more on the powered axles.
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