The engine called PRINCIPESA ELENA / PRINCESS ELENA is the second steam locomotive manufactured in Greater Romania / The Kingdom of Romania (series 704.402, initial number plate – 15.).

The first one, called PRINCIPELE CAROL / PRINCE CAROL (series 704.401, former initial plate number – 14.) was repealed in 1970. The two locomotives were the first directly developed by the local engineers of the U.D.R. S.A. / Steel Works and Domains of Resita. And also the first one designed and manufactured as so in Romania.