>>856489Because those cab unit locomotives usually topped out at 1500 HP per unit, most locos in use today average about 4000 HP each. But cowl-body types were still present on Class Is into the 2000s, like the F45s, and Canadian railroads still have plenty of cowl-body units in operations. Some shortlines still use 60+ year old F-units and other cab units in their operations. Most Amtrak units are cab/cowl style as well. The big issue is visibility for the operating crews, cowl/cab types have less visibility than hood units.
>In recent years, locomotive manufacturers have switched from cab units to cowl units when a full-width body is desired. Since all the structural support on a cowl unit is in the frame of the locomotive, rather than the body, manufacturers can easily create full-width locomotives from hood unit designs by building cowl units.