In order to test the loading and emissions for the SD70ACe-T4, EMD needs it to throttle up. Without an actual train to pull, the best way to do that is to take a couple of other units and put them in full dynamics while climbing a grade. Simulates pulling a train. Interestingly, a GE ET44AC (GE's own Tier-4 compliant unit) will be helping in this test.
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