Soo Line B-4 class
UIC class C h2
4 ft ( 8 in 1⁄ 2 1,435 mm)
Driver dia. 51 in (1,295 mm)
Loco: 11 ft 6 in (3.51 m)
10 in (17.94 m) 3⁄ 8
10 ft 5 in (3.18 m)
3 in (4.66 m) 1⁄ 2
Axle load 51,500 lb (23.4 tonnes)
151,000 lb (68.5 tonnes)
102,900 lb (46.7 tonnes)
16,000 lb (7.3 tonnes)
5,000 US gal (19,000 l; 4,200 imp gal)
2 (1.24 MPa)
Cylinders Two, outside
Cylinder size 20 in × 26 in (508 mm × 660 mm)
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 and gives free rides annually at the Western Minnesota Steam Thresher's Reunion, Rollag, Minnesota.
References [ edit ]
Gjevre, John A. (1990) . Saga of the Soo, West from Shoreham (Second ed.). Moorhead, Minnesota: Gjevre Books. p. 176.