Well for Western Roads, who can neglect the Southern Pacific and the Santa Fe . Here are some examples of those roads from Marx. The #6000 SP F-3 from 1952-1954 and the largest diesel Marx produced the #21 Santa Fe F-3 warbonnet made between 1950-1954. Both of these locomotives are lithographed tinplate, single motor, powered A and dummy A.
Happy "Hump" day, best wishes
Don