I think I'll try the "best" way. Thanks again for your help.

OK, I can check gauge again. How is wheel gauge adjusted on a loco? Really appreciate the help.

If the wheel flanges are too deep, how does one correct that without ruining the wheel?

I'm using automatic polarity reversers and ground throws. I don't think the problem is electrical. The loco enters the diverging route and then binds and starts to lift up at the frog. It goes through with no problem on the straight route.

I have two 44 tonners and two 70 tonners, both purchased new with decoders. I use Atlas code 55 track. These four locos cannot traverse the diverging leg of the turnouts without getting stopped over the frog. I've checked wheel spacing, track spacing, guard rail clearance, trip pins, etc. All of my other locos have no problem like this. Any one else with this problem? Any fix would be appreciated.