Lego/Plarail Flatbed Car

I sort of expected a full LEGO construction designed to be compatible with Plarail (it is possible - The track is 4 studs wide, and there are numerous ways to recreate Plarail couplings accurately). I found out it was actually factory made and the seller placed LEGO bricks on it to demonstrate the stud feature (as evidenced by LEGO's red being a darker shade than that used on the flatbed, and the flatbed having unmarked studs).