IB&O Engine #1 was the first of several 4-4-0 locomotives operated by the Irondale, Bancroft & Ottawa Railway in central Ontario, Canada. #1 was purchased from the Grand Trunk Railway in 1886. Samuel Edward Hancock, its first engineer, nicknamed it "Mary Ann" after his wife. Precise details are not clear, but it appears #1 was originally built as a 2-4-0 at 5'6" broad gauge by Birkenhead in the UK in 1855. It was converted to standard gauge some time in 1872-74, and sold to the Grand Trunk. It is presumed to have been scrapped some time between 1907 and 1910.