 | |
 A postcard advertisement for the railroad's service between Minneapolis/St. Paul and Duluth/Superior, circa 1910 | |
| Overview | |
|---|---|
| Parent company | Canadian Pacific Railway, Canadian National Railway |
| Headquarters | Minneapolis, Minnesota |
| Reporting mark | SOO |
| Locale | North Dakota to Chicago |
| Dates of operation | 1883–1961 |
| Successor | Soo Line Railroad, Canadian National Railway |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
The Minneapolis, St. Paul and Sault Ste. Marie Railroad (MStP&SSM) (reporting mark SOO) was a Class I railroad subsidiary of the Canadian Pacific Railway in the Midwestern United States. Commonly known since its opening in 1884 as the Soo Line[1] after the phonetic spelling of Sault, it was merged with several other major CP subsidiaries on January 1, 1961, to form the Soo Line Railroad.