I started this Christmas running a 261e MTH LCT engine with 600 series cars and it went very well. These all have box couplers. Next I got a three car set Peacock green with latch couplers and although they seemed a little stiff around corners, they run well. This was on a loop without switches.
I just got my MTH LCT 256 with 700 series cars and these latch couplers seems to be causing the wheels of the cars to lift off the track going thru switches. I needed to bent a few so they match up better but I would not say they are solid runners.
Anyone have any tips ...running on Fastrack with 036 and 031 switches and curves.