Harold Krommes and his scale model Rock Island steam locomotive

From steamlocomotive.com :

"The Chicago, Rock Island & Pacific Railroad received two "Mountains" (road numbers 998 and 999) from the American Locomotive Company in 1913, and became the third railroad to take delivery of this wheel arrangement. These two oil burning locomotives had 28 x28 cylinders, 69" drivers, a boiler pressure of 185 psi, a tractive effort of 50,028 lbs and a total weight of 333,100 pounds." These were later renumbered 4000 and 4001. Where is the model now?