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Just a question for all you UP Big Boy owners........ I have a Trix Big Boy and find that it's pulling power on the flat is unbelievable, 50 cars or more is no problem. However, I have a section on my layout with a 4% grade and the Big Boy can only pull 4 NMRA weighted cars without slipping and finally stalling with wheels spinning about halfway up, no matter what speed I try, even with a running start at full throttle! (It is a curving grade with 22" radius about 6 feet in length total) <br /> <br />My Rivarossi Challenger (newer model with can motor) can pull 16 cars up the same grade at any speed without slipping once. I realize that the Riv has traction tires, but it weighs less than half the Big Boy. <br /> <br />Track & wheels are clean, no oil residues, etc. Any ideas? Help please!
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