Weaver model was a Baldwin 2-8-0. At the time, Weaver did (several of these models), with different paint/different railroads. The Baldwin/Alco discussion was done 20 plus years ago.
Last trip to the Grand Canyon, #29 is an Alco steam locomotive.
As mentioned these late steam locomotives, one at the GC, and one, Cumberland MD., were from LS&I. Lake Superior and Ishpeming, An Iron ore hauling railroad.
734. Cumberland, MD.
I don't know of any models of this large 2-8-0. The 734 tender was also different, a larger tender for the Maryland Railroad.
Neither is operational.