Rising Sun herald theory doesn't seem correct since other engines and cabooses kept their block style lettering logo. My quess is paint or they lost the templet. I also looked in printed sources and found there to be no photos of 0404 beteen 1942 to 1946 in which I could see the herald. It appears the change was sometime during this time period I will check my slides. Maybe someone at the museum knows the date and reson for the change.