Thomas & Friends Trivia or Fun Facts Game

So...

Plarail
TomyTrains/Tomy Trains
International Motor Road & Rail
Plarail (white running plate) C-cell
Tank n Action
Plarail bee stripes
Plarail with banners (the one that came with the animal carrages (cow car?))
Plarail with banners (the one with the carnival rides)
Plarail AA
Plarail talking
Hit Toys flip-face
HiT Toys standard
HiT Toys Buzz Buzz
FP standard c-cell
FP standard AA
FP talking
FP snow clearing
FP 3-speed
Revolution standard
Revolution scared
Revolution with the scratches or hay from that spooky set

I think that's 21, but not all are special. Not counting standard ones, I think I hit 12. Assuming you ment different engines, not different combinations of engines and trucks. And I think I'm still missing a few.