TOMY Tomica Hypercity Rescue Arctic Minig Rescue Train Set

I love Tomica (great details, decent construction, cool designs, tracks work with US Thomas trains, buildings work with hot wheel/matchbox cars, etc.). I'm a mom of 3 and 4 year old boys. The younger one started playing with Tomica at 2. With this particular set, I enjoyed each piece except for the mountain landscape. It is made of 2 pieces of durable, coated paper. It held up well against tears, but kept coming apart from the rest of the track. For the price, I think the set it worth it just to get the other pieces. I would just not use the mountain.