this is sort of like collecting sport cards, there is no guarantee you will get one of each. i suppose you have to buy a couple of boxes or search them on ebay or something at a later date
My Trackmaster/Tomy/Plarail Photo Gallery Page (over 600+ photos and still under construction)
https://www.flickr.com/photos/183311600@N03/
https://www.flickr.com/photos/183311600@N03/