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A little later in the afternoon, engines 3412 and 6506 switch the interchange traffic from the Magma Copper Company. Just behind the units is the dumper building.
Engines 6506 and 3412 are moving the interchange cars down to the yard at Hayden while engines 6511, 3644, 6661, 6600, and 6562 finish shoving the loads through the dumper. Disk 57