Rarest Plarail/Tomy Trains

I am no expert, but i think the tony busy bee James is rare as well, as I have one, and did not even know what it was until other day, and I have not seen one for sale often only once on ebay.

Then again I havent been looking for one, but ended up with one from that massive lot i scored not long ago

Busy bee James is becoming very hard to find, and increasingly expensive, but with determination and money it can be found and aquired...but a true RARE train cannot be found!! Trains that are only seen a couple times a year at auction...
Also, after considering the 4 I mentioned earlier, I would rank T'nA Henry & Gordon as equally rare for these reasons:
Though I have yet to ever physically see the Henry model, there IS an image of the train and box online to view, but there is only an empty box to show for the Gordon model...AND of the D&D snowplow set, though it is rare and fetches an incredible premium, I have already seen 6 different sets come up at auction in 6 months, where as in the case for Alfie I have seen maybe 10 over the course of 6 years!!
THIS rate of frequency in availability is what truly determines RARITY.
All the money in the world can't buy something if you can't find it.