In my past 3-rail experiment I switched to GarGraves exclusively. I had older and newer GarGraves. Mechanically, they're great. No derailment issues, etc. (Note: I ran mostly traditional sized engines.) I also loved their sectional track w/plastic ties.
If/when I do another 3-rail layout, I will not hesitate to return to GarGraves.
GarGraves offers a good line of track products.
EDIT: Forgot to mention that used some 042's as crossovers to an industrial spur. Both can be seen on the track to the left in this photo. No issues.
Andre