Alexander Bain Moncrieff CMG (22 May 1845 – 11 April 1928) was an Irish-born engineer, active in Australia. Moncrieff was the son of Alexander Rutherford Moncrieff, and was born in Dublin, Ireland. His family was of Scottish ancestry. He was educated principally at the Belfast Academy, and at 15 was articled to C. Miller, engineer in Dublin to the Great Southern and Western railway. His seven years apprenticeship included manual work in the blacksmith's shop, and he obtained there an understanding of his fellow workers which was valuable in later years. He was afterwards employed at the Glasgow locomotive works for two years, and subsequently at Dublin again, and in private practice in Hertfordshire, England. In November 1874 he obtained a position as engineering draftsman with the South A