Skip, that engine is in one of my earliest memories, of my dad running it around switching cars. Except for in its early life maybe, it only saw service at Christmas time, as is still the case, so it is pretty well preserved.
Rick, the mountain is a wooden support structure, made from scraps, then crumpled newspaper covered with hydrocal mesh sheets, and covered with extra hydrocal for strength. It is dyed with woodland scenics hydrocal dyes: white with a touch of grey. The snow is woodland scenics snow soaked with scenic cement. The whole thing just lifts off. The side wings are white styrofoam sculpted to the desired shape, and covered with hydrocal sheets, etc. like the main mountain.
before snow:
