I don't want to open one because they all are sealed and easier to sell as new but my estimation is that the are about 5/8 inch wide. The wheels are very small, smaller than Plarails smallest wheels on some rolling stock. Plus, looking closely to the drive wheels which are on the middle car, there looks to be about 1/8th inch clearance between the outside edge of the rubber and the axle cowl covering what may be a gear. My guess is that these would have much trouble running on the Tomy tracks if they could roll on them at all. Another guess of mine would be that these are closer to HO/OO scale rather than Plarail.
![[Image: IMG-0367.jpg]](https://i.postimg.cc/LgmNx4sq/IMG-0367.jpg)
![[Image: 7071.gif]](https://www.allsmileys.com/files/sweetim-texticons/7071.gif)