Porter09
It is well worth the effort to add weight to the boiler and leading truck with the 4 wheels. This engine is very light with a small DC motor and needs the extra weight ( I used old tire weight) to have more traction. It now will pull four cars plus tender now.
I found mine had trouble with derailing the front wheels and adding a couple of washers helped keep it on the rails. I glued the tire weight in the boiler and washers on 4 wheel truck with clear silicone caulking. Alieens glue will work too.
Charlie