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It has limited traction. It's a heavy die-case loco and it pulls quite a lot (12+ cars on the level), but spins its wheels when pulling more than seven scale reefers and a caboose up a 2.5% grade around a 72" diameter curve. But it did make it up the grade, slightly spinning its wheels the whole time.

A little frog snot fixed that . . .
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I often run up/down a prototype 2.6+ percent grade. One 2000 HP Alco C-420 is only rated for about 700 tons on that grade. Figured at approximately 132 tons average car weight and that lone Alco is only good for 5.3 loaded cars. (Or 5 loads and a couple of empties.)

Proportionately speaking, your Ten Wheeler is doing much better than than the prototype Alco C-420. It's pulling MORE than in should up such a grade. A Ten Wheeler typified by the Williams model would be HARD PRESSED to get more than 250-300 tons up that 2.6%. Grades are KILLERS on the prototype. Typically, models do better on grades than their real life counterparts.

Given your experience with your new Ten Wheeler, you now see why prototype Ten Wheelers working a mountain division were supplanted by 2-8-0's which were supplanted by bigger 2-8-0's which were replaced by 2-8-2's, which were... you get the picture.

Andre
I seem to be experiencing a little bit better pulling from my Williams AT&SF 4-6-0. I have it pulling the 8 (baby Madison) Polar Express cars on a folded figure-8 with one loop elavated over the other using the Fastrack Tressle set (5.25 inch in 100-110 inch) ~5% slope.
While the engine/train slows quite noticibly as it climbs the grade and speeds up quite a bit when on the down grade I do not notice any slipping. I can set the track voltage so that it just creaps as the locomotive creast the grade (all 8 PE cars on the grade) or run it fast up and faster down.


(note: this photo doesn't show all 8 PE cars in the consist)
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