Minneapolis, St. Paul and Sault Ste. Marie Railroad

Minneapolis, St. Paul and Sault Ste. Marie Railroad

A postcard advertisement for the railroad's service between Minneapolis/St. Paul and Duluth/Superior, circa 1910
Overview
Parent company	Canadian Pacific Railway
Headquarters	Minneapolis, Minnesota
Reporting mark	SOO
Locale	North Dakota to Chicago
Dates of operation	1883–1961
Successor	Soo Line Railroad
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.