doctorwayne said:appeared as if the frog was lifting the rigid driver sets enough to lose contact. I used a large mill file to correct the problem.
So you filed the TOP of the frog, right? I did notice that a couple of the turn-outs seemed to have the frogs set a little too high.
Here is my theory: I have the following locos: Athearn CF-7, GP-35, and P2K GP30. All of these are short wheelbase 4 axle diesels. It seems that when the rear truck is completely on the point rail, the front truck has a wheel on the frog, the frog lifts the front truck up slightly making the other wheel lose contact with the rail, and also the tilting truck may upset the contact with the metal loco frame, in the meantime, the point rail doesn't have a real good connection to the power source, so the rear truck on it isn't getting perfect power either.
Here are the proposed fixes:
Choice 1: Rip out the Atlas and go with Peco (but what problems do they have?)
Choice 2: A combination of some or all of following:
A. Power the frog
B. Do some file work on the frog for a smoother ride
C. Clean the area where the points contact the stock rails(? the two outside rails)
D. Solder tiny little jumper wires from the stock rails to the points