I believe the fuel burn of a SD70 is around 190 gallons per hour in Run 8
The UP is saving about 500 bucks in fuel for each Arrowedge they run on a train between Chicago and the Western ports on a round trip. However if they are getting anything over a quarter a mile in revenue per container they would make more by shoving another load on the stack. The fuel savings overall are not worth what they could make with another load in this case.
A few weeks ago I met an intermodal with an arrowedge on it. It was about 1/3 to 1/5 of the way back in the train. I suspect it picked up a block at Rochelle, putting the arrowedge back in the train.
Jeff
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