I would think if someone is wanting the polar express train, they want to put it around a Christmas tree. Depending on the size of the tree, HO would most likely look really small. I don't own the set but looked at Amazon reviews, specifically the 17% 1 star reviews. Most people said the set looks nice but the track is garbage. It connects magnetically and needs a really flat surface to work. Personally I think the set looks nice, better than the cheapo O gauge version but I don't think it's worth what Lionel wants for it.