Soo Line B-4 class
|Type and origin|
|Builder||American Locomotive Company|
|Build date||1915 (6), 1920 (5)|
|UIC classification||C h2|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||51 in (1,295 mm)|
|Wheelbase||Loco: 11 ft 6 in (3.51 m)|
|Length||58 ft 10 3⁄8 in (17.94 m)|
|Width||10 ft 5 in (3.18 m)|
|Height||15 ft 3 1⁄2 in (4.66 m)|
|Axle load||51,500 lb (23.4 tonnes)|
|Locomotive weight||151,000 lb (68.5 tonnes)|
|Tender weight||102,900 lb (46.7 tonnes)|
|Fuel capacity||16,000 lb (7.3 tonnes)|
|Water capacity||5,000 US gal (19,000 l; 4,200 imp gal)|
|Boiler pressure||180 lbf/in2 (1.24 MPa)|
|Cylinder size||20 in × 26 in (508 mm × 660 mm)|
|Tractive effort||31,200 lbf (138.78 kN)|
|Operator(s)||Minneapolis, St. Paul and Sault Ste. Marie Railway (Soo Line)|
|Number in class||11|
|Disposition||Two preserved, of which one is operational|
The Soo Line B-4 class were 0-6-0 steam locomotives constructed for the Minneapolis, St. Paul and Sault Ste. Marie Railway (Soo Line) by the American Locomotive Company. Six (#344–349) were built at their Schenectady plant in 1915, with a further five (#350–354) being constructed by their Brooks plant in Dunkirk, New York in 1920.
They were the last, and largest design of purpose-built switch engines that the Soo Line owned, any heavier switching duties were performed by down-graded 2-8-0 freight engines. All were still on the active roster in May 1953, but all had been retired by the end December 1954 when the railroad completed its dieselization.
Two are preserved - #363 from the first batch which is displayed at the Wheels Across the Prairie Museum at Tracy, Minnesota as Dakota, Minnesota and Eastern #9, and #353 from the second batch. which is operational today and gives free rides annually at the Western Minnesota Steam Thresher's Reunion, Rollag, Minnesota.
- Gjevre, John A. (1990) . Saga of the Soo, West from Shoreham (Second ed.). Moorhead, Minnesota: Gjevre Books. p. 176.