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Soo Line Historical and Technical Society

Locomotive Drawings

F-Units

This locomotive series was covered in the Fall 2004 issue of the SOO, which included a poster with colored drawings of these locomotives. Poster available for purchase.

HO scale: 3.5mm=1 foot. Drawn for the Soo Line Historical and Technical Society by Rick Johnson. ©2004 SLHTS

Soo Line 200 was the first F-unit on the Soo, built in October 1947 as a two-unit 3,000-h.p. set. This pair comprised the only phase II F3s on the railroad, and are easily recognized by the high shrouded radiator fans on the top and the "chicken wire" covering the side vents. This view shows the 200-A as it appeared shortly after being put into service.

Soo Line 202-B is a phase III F3 built for the M.St.P.&S.Ste.M. in January 1948. It had the newer, low-profile radiator fans, but retained the vent screening used on phase II F3s. It1s shown as modified by the railroad in the late 1950s, with grabirons running up the right side of the nose, skid-resistant material, grabs above the front windows, and cab sun shades.

Soo Line 2200 (a.k.a. the "Queen Mary") is a 4,500-h.p. locomotive set built for the Wisconsin Central in September 1949. Although its appearance is that of an F7, it’s actually a phase IV F3. It was originally intended to work as a three-unit set, but the -A, -B, and -C subletters were added to the numberboards when they were added individually to the locomotive pool.

Soo Line 2230 was the last F unit built for the Soo Line in August 1953. As a phase II F7, it had vertical side vents and vertical style large Farr air grills, rounded-corner doors, and lacked the roof overhang at the rear of the locomotive. The fuel tank skirting was removed in the 1960s for easier maintenance. The grabirons on the nose and rerail frog were added in the 1960s.

Soo Line 2204-C was unique in that it was the Soo's only phase II F7B, built in July 1952, and it was also the only cabless unit purchased as a spare booster. The center porthole on red and white booster units was sometimes painted over to accomodate the middle "O" in "SOO."

Soo Line 212-B shows how the pilot step was later removed from F-units. The rear door window was blanked out and the diaphragms eventually removed. In some cases, but not shown here, steel kick plates were added behind the nose grabirons. Rear lights were originally of the removable type that mounts in the doorway, but permanent lights were added to some units.

Soo Line 503 was a phase I FP7 with a phase I F7B booster locomotive built in March 1951. The drawing depicts it as new, with the cabless booster still designated as 503-B, later changed to 503-C. Both units were equipped with steam generators for heating passenger cars and winterization hatches on the roof to help heat the interior of the locomotive.

Soo Line 2224-B was one of several locomotives repainted shortly after the 1961 merger in a plain maroon paint scheme originally intended to be the new standard scheme for the "New Soo."

copyright Soo Line Historical and Technical Society