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It is 8:30AM on February 3, 1973 at Black River interlocking tower south of Seattle, WA. Milwaukee Road number 3 was one of the rare FP45s. The engines have finished setting out the cars for Seattle in a small yard around the curve. Leaving the rest of their train in the yard, the engines have come up to the tower to pick up train orders. After receiving the train orders, the units will move back to their train and then head south down the valley to Tacoma. Notice that on this train order signal, that both blades are square.