If you are referring to the Classification Lights, i.e. "Class Lights", on the front of locomotives, the color green would NOT generally be correct for a freight locomotive. In the real world of railroading, the color green in the Class Lights, indicated that a Second Section of that train is following. Thus, white Class Lights, which indicate an Extra Train" (not scheduled), would be more correct for the NKP (NOT 'NPR') Berkshire.
Lots of freights ran on schedules as 2nd 3rd and 4 class trains. Displaying Green is quite appropriate if there's following section.
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