Well, it's slightly larger than the track, but probably not wide enough for Fn3 - might be OK for LGB loading gauge.I think maybe the diameter (54 mm) is inadequate?
Indeed you certainly do nit want the ‘wrong kind of snow’.It probably depends on the type of snow, which in the UK is generally 'wet', with larger flakes which tends to compact. What our railways need is 'dry' powder snow -useless for snowballs, snowmen, etc.