Rarest Plarail/Tomy Trains

I've recently been inactive on BPT for quite a long time (over a year) and was just wondering if we could get another revamp or update to this thread just so we can all know which trains are the most rarest. Although this thread i started all so long ago is says its only related to Thomas and Friends, maybe we could see some regular japanese plarail trains (not thomas and friedns) being added or accompanying the list so we can a whole comprehensive list. Although i have been inactive i've also wanted to know if trains such as the talk n action gordon and henry are still rare, and even the donald and douglas snow plow set.

Thanks in the future for any replies and happy collecting!!!