Just set up the track last night and it appears as if the connection to the engine is being pinched when the train goes into a corner. I wish they had just used a regular coupler for that car because we could just run without it. I do not know if the frame of the engine is not aligned with the body and is causing it to pinch the plastic nub that rides in the groove between the body and frame? Any ideas would be helpful - my boy is very disappointed at the moment.