10 & 14 vs 190s

I'm not surprised that 12 can out pull 190. 10, 14, and 12 are comparable to WP&Y's 4-6-0 #62 in terms of weight and TE. While the 190s could never handle more than 92 tons up the 20 mile hill out of Skagway, 62 could pull 130 tons. Likewise the SVRy mikes WP&Y 80 & 81 could haul 160 tons and the WP&Y 70 series mikes could haul 170 tons. The 190s and their 42" and meter gauge sisters were designed for the flatlands of North Africa and India, so it's not too surprising that they never did well in hilly country.
After the war the Army traded 192 and 196 to the WP&Y for 61 and 62 which were worn out by the war effort. The Army tried to sell the other nine 190s to the WP&Y who said no-way and instead bought two more 70s, which were designed for the White Pass.
In the end, the Army shipped 197, 198, 199 & 200 back to the lower-48 for sale and salvage, and left 190, 191, 193, 194, and 195 for the WP&Y to run, sell or scrap as they saw fit. It's a good thing that the WP&Y sold 190 and 192, otherwise we wouldn't have such fine operating examples of this unique 3ft gauge wartime MacArthur design.