For a long period of time, it was very unusual to find EMD power on UP mainline trains in Colorado. That trend has changed quite a bit over the course of the last few years. While GEs are still prevalent on most trains, it is certainly possible to find a train with all-EMD power. Case in point is the pair of SD70ACes and SD70M that lead up this westbound manifest in Barbara's Gulch. The DPU keeps the train from being exclusively EMD as an SD70M and ES44AC work to push on the back.
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