My Dad's grandfather was Murray B. as well. His name was Robert (Sherry), son of Graydon.
I live at Tobique Narrows, about a mile from the site of the bridge that my dad told me, his great Grandfather fell from.
Murray B was a section foreman and his son Graydon was a section man as well.
I don't know if we have had the pleasure, but I remember meeting Donald Harvey a few times.
Murray B. Grant