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It sounds to me to be a traction problem. I have an old LGB Mogul that has this same problem. I have one area of my layout where it pulls up a 3% grade while going around 8' diameter curves. I can only pull 2-3 cars with this engine. If I add more cars, it causes the engine to stop on the grade with the wheels slipping on the track. Leveling the track (as others have pointed out) will likely help since uneven track could result in only 3 wheels being in contact with the track which reduces traction. Adding weight to the engine might also help. You could also look into reducing the load the engine is pulling. Are you loading anything on the cars (i.e. adding more weight)? If so then you are increasing the load the engine has to pull. You could also try lubricating the wheels on the cars to reduce friction (LGB Maintenance oil, part # 50019). Just be careful, a tiny drop on the axle portion of each wheel is sufficient. You might also want to examine the engine and cars to make sure none of the wheels are binding or rubbing since that would also add friction. Jon
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