I only have less than a one inch climb in the basement spread out over maybe ten to twelve foot area? I didn't level out the old benchwork from the G scale trains. So a single smaller steamer pulling a big train can spin or stall if it doesn't have speed at the "hill". A larger articulated or a double headed train is fine even if stopped and restarted. So I use the slight hill as a gauge at what has good pulling power, or how much pool power to apply to a length of cars.
(It crests right at the end of this new mountain.)
These 2 two rail Dreyfus Hudsons will pull about anything I throw at them. One will pull this train but not if stopped right before this climb. I like this and won't change it or add any traction to the stock MTH engines. Now the Weaver M1 I just converted needs some work to get better traction. I wish all the drivers had flanges and would touch the rails.