CJ,
The 300 and 700 class engines were all hand fired. As for the Pacifics and Mikados, that depends. Most newer engines did receive stokers, but some where either scrapped or converted to 200 class switchers before receiving stokers. By the end of World War II just about all remaining Pacifics and all 1200 class Mikados had stokers. An exception were the N-1 and N-4 Pacifics which did survive the war but were scrapped in the mid to late 1940's. They never had them applied.
JD