The Grand Trunk Western owned five 4-8-2s in class U-1-c, delivered by Baldwin Locomotive Works in 1925. They incorporated some typical modern Canadian National Railways steam locomotive features, including the Elesco feedwater heater, all-weather vestibule cab and Vanderbilt tender. (The sheet metal fittings around the stack were an experimental device to control smoke, later removed.) Originally assigned to heavy passenger service on the Chicago-Port Huron main line, these Mountains were displaced by the more powerful 4-8-4s of class U-4-b in 1938 and U-3-b in 1942 — and perhaps for a time by the earlier class U-3-a of 1927, until those engines were withdrawn from passenger service in the 1930s. The GTW gradually equipped the U-1-c class with disc drivers. As shown here in this undated view by James Adams from Rail Photo Service, No. 6037 still has the outer drivers spoked, but by the end of her service life she sported a full set of Boxpok drivers as seen in a photo on the next page. For the specifications of this class, see the commentary on No. 6040.