I wanted to come here and say I'm actually impressed my Thomas was able to pull 6 coaches. My tone and caption do come across as negative, so I do apologize for that.
I know the coaches derailing is not the fault of the Thomas, and I'm surprised the one I purchased was able to get them up the hill. I know many can't even pull 1 truck. I might set up a different layout tomorrow and see how much he can haul!