Canadian National Railway class O-8 was a class of type steam locomotives. Forty-four tank locomotives were built by the Grand Trunk Railway (GT) in their Point St. Charles shops from 1884 through 1895. Most were built with round-topped saddle-tanks and classified as F4 by GT and later O-8-a by CN, but the eight built in 1887 had rectangular side tanks and were designated as class F3 by GT and O-8-b by CN. Thirty-nine of the class survived to receive CN numbers, but most were scrapped or sold within the first decade of CN operation. Two remained in service until 1940. CN number 7105 was sold to Consolidated Sand and Gravel Company in 1928 and served as their number 101 until repurchased in 1952 for the CN Museum Train. It was renumbered 247 and transferred to the Canada Science and Technology Museum in 1967.
DateWorks numbersGT numbers (first)GT numbers (1898)GT numbers (1902)GT numbers (1910)CN Nos. (1923)QuantityRetiredNotes1880 1053–1054 20, 23 621–622 16–17 2567–2568 — 2 1918 sold to industry18841140–1143, 1146–1147, 1145–1146 13–19, 21 623–630 18–252569–25767085–7091 8 1919–1937 18871155–1162 25–26, 29–30, 34–37 631–638 26–332577–25847118–7123 8 1920–1928 built with side tanks; GT class F3, CN O-8-b; one sold to industry18891173–1178 22, 24, 27, 32–33, 38 639–644 34–392585–25907092–7097 6 1925–1926 1893–18941264–1273 5–8, 28, 31, 247–250 645–650, 662–664, 651 40–45, 57–59, 472591–2596, 2598–2600, 25977098–7103, 7105–7107, 7104 10 1925–1940 Five sold to industry18951282–1288, 1279–1281 251–257, 46, 245–246 652–661 47–562601–26107108–7117 101924–1940
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