Interesting Clear Train

Here is a clear Limited Edition release of the 300 Series Shinkansen that I have seen before but never really took a closer look. Notice something different that is not seen in any other Plarail train (that I know of)?

Thats it, Besides black and cream colored I haven't seen another color on a motor. Quite a neat touch for the clear trains. All the clear releases should have a different colored motor housing. Better yet, how about a clear motor housing showing the gear action, now that would be neat...are you listening Plarail?

So what do you know about this yellow motored 300 series train?
We have one just like it BNIB (all white unlabeled box) that I picked up quite awhile ago...I had a feeling it was special so we've never opened it up... How limited is it?