I feel your pain Walt. I have a little ETS switcher that will only pull about the same amount of cars but there is no provision on the wheels for a traction tire. I added a little more weight to it by using stick on weights I got on EBay it helped a little but I came to the conclusion it’s only going to pull so much and that’s it. Something you might want to try if your engine is not happy with all five cars is just alternate the cars around so the train has a different look to it instead of all 5 together.
This is a video of the little guy in action the cars a heavy beacause the trucks are solid die cast but the bodies are tinplate.
