St. Maries River Railroad
| Overview | |
|---|---|
| Headquarters | St. Maries, Idaho |
| Reporting mark | STMA |
| Locale | Idaho |
| Dates of operation | 1980– |
| Predecessor | Chicago, Milwaukee, St. Paul and Pacific Railroad |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
The St. Maries River Railroad (reporting mark STMA) is a shortline Class III railroad that operates 71 miles of freight service in northern Idaho. From 1980 until 2010, it was a subsidiary of Potlatch Corp.