Caption: CN H12-44 1631 works at the east end of Mimico Yard at Church Street (the present-day Royal York Road underpass) in 1955. Note the Milnes Coal Co. dealer in the background, on the east side of Church St. to the north of the rail corridor (Milnes was a very popular coal dealer with multiple locations in the Toronto area, back when coal was used for home heating).

1631 was part of a 10-unit order of FM H12-44 switchers built by CLC in Kingston in 1955, making the unit only months old when this photo was taken. CN acquired 20 additional H12-44 units in 1956, and for most of their lives they were assigned out east (operating on lines in Quebec, Prince Edward Island, Nova Scotia and New Brunswick). By the mid-late 60's the switchers, along with the rest of CN's FM/CLC fleet, would be retired from the roster and scrapped.