I been wanting one of the B-42's that has the stabilizing plate for a bit now. This was the last big engine that SlowJoey had from Carl's collection, which is where my older B-42 came from. There is even another B-42 that has a stabilizing plate but also has rings on either side, like pulleys, that I image completely stops the side to side slop between the wheels. I wished I had one that that but I couldn't pass up this one from SlowJoey when he called me up a few weeks back.
Here is a pre-view video: straight from the shipping box to steaming! You'll see how well that went if you watch the video LOL