Board Thread:Questions and Answers/@comment-26828130-20180417092850/@comment-29878506-20180422200718

OK, ran into something new. The Puffing Billy set is no longer available, which means it's not really 'Train Set (Shop)' anymore. Do we want yet another category, such as source = n for 'Train Sets (Not Available)' or 'Train Sets (Removed)'?