I have a 2% grade on my layout...for longer passenger trains I need 3 Sunset F7 locos to keep from slipping as they have no traction tires. I carefully watched the couplers for vertical sliding between cars as they transversed the hill, and adjusted the risers accordingly. Sometimes screwing a 1x4 underneath the roadbed creating a "T" cross-section for rigidity. My Atlas MP15 was unable to make it with a 3-car set of diecast Maxi-stacks. I may need to add some weights on the inside of that loco for ballist.
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