One complaint! On the intermodel car's,PLEASE,PLEASE,PLEASE ! Get rid of those stupid Rapido couplers! PLEASE ! I have a couple dozen of the single car's and one set of the 5 unit articulated one's and have had to change all of the wheel set's out.I also to GRIND all of the car's wheel well's out on my bench grinder to get them to roll.I have tight turns on my layout and I had severe problems with the wheel's rubbing the center rib behind the wheel's.I do love them being made of metal though!