 Although the locomotive was a success, the 1930s brought the national depression and Santa Fe adopted a policy of avoiding capital expenditures during this period.By the time the next 2-10-4s were delivered in 1938 they were placed in a different class because of many design refinements.With the various classes of 4-8-4 types, the 2-10-4 type represented the pinnacle of modern heavy-power development on the Santa Fe Railway System.