Mysterious Chuggington Zack

I saw this in Leokimvideo's recent BRIO video. It appears to be Chuggington Wooden size and gauge, but is motorised and has a Die cast/Interactive/Motorised style coupling. Not to mention, it's extremely fast, for some reason I don't understand. He says it's for the StackTrack system (Chuggington Die cast), but it looks larger. It is not part of the Chuggington Motorised lineup, which uses moulds from the Interactive Chuggers. I couldn't find anything about it on the Chuggington Wikia or on TOMY's website, so I need help here. Is it official?

http://youtu.be/12ulJb3QKwU?t=24m55s

UPDATE: Nevermind. I found out it's a part of a new StackTrack range with motorised Chuggers.

Glad you found out.