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.