I have the old style Polar Express with the non-snow roofs and was considering trying to add that effect. Over the years I have added the lighted fire box, the drum head and redid the hobo car to make that look much better last year by adding real wood and a flickering red and amber Leds. How about the roofs? No info on this I can find anywhere. I am sure it has to have been done. Paint? Something glued maybe. Any help would be apparated.