The peculiar thing about this box is that it contains 70 pieces... but very often, when you buy it used it'll not contain them all or they put a different track in. As was the case with me. My "set" contains a mini straight that is not part of the set.
This happens because on the box it says it will have 11x short curved tracks... but it also says 1x next to a short curve somewhere else on the box's photo of the track. So beware, when buying this set, that it actually contains 12 short curved tracks, not 11.