weedmic, go ahead and bank the curves. I gradually entered and banked my curves and never had a problem, tried to describe in words, couldn't so took a pic. Both electric and live steam. If your couplers and trucks don't have a slight amount of play you are going to have issues anywhere there is a sudden and minor track irregularity. Smoothly entering curves and banking allows everything to gradually adjust to the new position. Among have a 34" long 1-A-1 Shark nose and 3 axle Heavyweights that have no problem. Seen any issues on my video's??