| Soo Line B-4 class | |
| Powertype: | Steam |
| Builder: | American Locomotive Company |
| Builddate: | 1915 (6), 1920 (5) |
| Whytetype: | 0-6-0 |
| Uicclass: | C h2 |
| Driverdiameter: | 510NaN0 |
| Length: | 58feet |
| Width: | 10feet |
| Height: | 15feet |
| Wheelbase: | Loco: 11feet |
| Axleload: | 515001NaN1 |
| Locoweight: | 1510001NaN1 |
| Tenderweight: | 1029001NaN1 |
| Fueltype: | Coal |
| Fuelcap: | 160001NaN1 |
| Watercap: | 5000usgal |
| Cylindercount: | Two, outside |
| Cylindersize: | 20x |
| Valvegear: | Walschaerts |
| Boilerpressure: | 1802NaN2 |
| Tractiveeffort: | 312002NaN2 |
| Operator: | Minneapolis, St. Paul and Sault Ste. Marie Railway (Soo Line) |
| Operatorclass: | B-4 |
| Numinclass: | 11 |
| Fleetnumbers: | 344–354 |
| Preservedunits: |
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| 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,[1] but all had been retired by the end December 1954 when the railroad completed its dieselization.
Two are preserved[2] -