Reply to "Surgery on Plastic Lenses for Observation Car Tail Lights"

GRJ is right, but . . . GGD has routinely used red led's on their observation cars where the lens is actually clear except when illuminated - doesn't look very realistic, though, when there is no power to the car. You can color the lens with any transparent red paint, or stop light red that has been thinned a little bit. I think that the same applies to Lionel lenses.