Welcome ![Grin ;D](https://www.bachmanntrains.com/home-usa/board/Smileys/default/grin.gif)
The first thing I would check is the cleanliness of the track.
But not all of your engines are doing this. Hmmm![Huh? ???](https://www.bachmanntrains.com/home-usa/board/Smileys/default/huh.gif)
Second how clean are Percy and Thomas's wheels?
You can clean them and try again.
Let us know how you make out!
![Grin ;D](https://www.bachmanntrains.com/home-usa/board/Smileys/default/grin.gif)
The first thing I would check is the cleanliness of the track.
But not all of your engines are doing this. Hmmm
![Huh? ???](https://www.bachmanntrains.com/home-usa/board/Smileys/default/huh.gif)
Second how clean are Percy and Thomas's wheels?
You can clean them and try again.
Let us know how you make out!