Don´t know why but I love this yellow beauty, I mean the DB BR111 especially in yellow. Could you bring the DB BR 111 Yellow also as a passenger engine? Any Trailer or even no trailer would do it, I would do the trailer compilation by myself anyway, but I would have a really good use for this engine as a passenger type.
And unfortunately I don´t know any (really working) way to change an existing cargo engine into a passenger engine.