J - Class Headlights

[NW Mailing List]

After studying recent photos of J-611 moving to the Roanoke Shop, I've noticed that some J-Class locos seem to have single lamp headlights and others have dual (over & under) lamps within the typical single lens.  If this is correct, can it be explained as a design evolution or is there something more interesting going on?

Thanks,  Bob Brown
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