AMTK 189 has been the trailing unit on the Zephyr for the past few weeks, but it looks like Amtrak did some shuffling around in Chicago as the "Big Game" unti is now on the point, leading the train west. Engines seem to stay on the same long distance train, in general, for 4-6 round trips before being rotated off. That's not any kind of hard-and-fast rule, just seems to be the normal based on general observation.
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