Sothern Pacific Berkshires

Does anyone know if Southern Pacific Railroad had Berkshires (2-8-4)?

Yes, Southern Pacific did have Berkshires.

According to Guy L. Dunscomb’s A Century of Southern Pacific Steam Locomotives:

They had Coffin feedwater heaters (the kind that look like hoods hanging from the smokebox), although there is a photo in the book of one of these engines with the Coffin feedwater heater removed, and the original tender replaced by whaleback (?- looks like an inverted bathtub) tender.

According to the book, seven identical engines were obtained from B&M by the Santa Fe. (Who also had their own Berkshires.)