| class="wikitable sortable"
!Name
!Mark
!System[This is one or more of the Class I railroads that the railroad became part of, if any.]
!From
!To
!Successor
!Notes |
| Alder Creek Railway
|
|
|1912
|1918
|N/A |
| Boise City Railway and Terminal Company
|
|UP
|1893
|1910
|Oregon Short Line Railroad |
| Boise, Nampa and Owyhee Railway
|
|UP
|1896
|1907
|Idaho Northern Railway |
| Burlington Northern Inc.
|BN
|
|1970
|1981
|Burlington Northern Railroad |
| Burlington Northern Railroad
|BN
|
|1981
|1996
|Burlington Northern and Santa Fe Railway |
| Camas Prairie RailNet
|CSP
|
|1998
|2004
|Great Northwest Railroad |
| Camas Prairie Railroad
|CSP
|NP/ UP
|1909
|1998
|Camas Prairie RailNet |
| Canyon Creek Railroad
|
|NP
|1887
|1888
|Coeur d'Alene Railway and Navigation Company |
| Central Idaho Railroad
|
|UP
|1910
|1914
|Oregon Short Line Railroad |
| Chicago, Milwaukee and Puget Sound Railway
|
|MILW
|1909
|1912
|Chicago, Milwaukee and St. Paul Railway |
| Chicago, Milwaukee and St. Paul Railway
|
|MILW
|1912
|1928
|Chicago, Milwaukee, St. Paul and Pacific Railroad |
| Chicago, Milwaukee and St. Paul Railway of Idaho
|
|MILW
|1906
|1908
|Chicago, Milwaukee and St. Paul Railway of Washington |
| Chicago, Milwaukee and St. Paul Railway of Washington
|
|MILW
|1908
|1909
|Chicago, Milwaukee and Puget Sound Railway |
| Chicago, Milwaukee, St. Paul and Pacific Railroad
|MILW
|MILW
|1928
|1980
|St. Maries River Railroad, Union Pacific Railroad |
| Clearwater Short Line Railway
|
|NP
|1898
|1914
|Northern Pacific Railway |
| Clearwater Valley Railroad
|
|UP
|1898
|1916
|Oregon–Washington Railroad and Navigation Company |
| Coeur d'Alene Railway and Navigation Company
|
|NP
|1886
|1897
|Northern Pacific Railway |
| Coeur d'Alene and Pend d'Oreille Railway
|
|UP
|1910
|1941
|Spokane International Railroad |
| Columbia and Palouse Railroad
|
|UP
|1882
|1910
|Oregon Railroad and Navigation Company |
| Craig Mountain Railway
|
|
|1921
|1965
|N/A |
| Craig Mountain Lumber Company's Railway
|
|
|1909
|1921
|Craig Mountain Railway |
| Gilmore and Pittsburgh Railroad
|
|NP
|1907
|1939
|N/A |
| Great Northern Railway
|GN
|GN
|1890
|1970
|Burlington Northern Inc. |
| Idaho Central Railway
|
|UP
|1886
|1889
|Oregon Short Line and Utah Northern Railway |
| Idaho Northern Railroad
|
|UP
|1906
|1910
|Oregon–Washington Railroad and Navigation Company |
| Idaho Northern Railway
|
|UP
|1897
|1912
|Oregon Short Line Railroad |
| Idaho Southern Railroad
|
|
|1908
|1916
|N/A |
| Idaho and Washington Northern Railroad
|
|MILW
|1907
|1916
|Chicago, Milwaukee and St. Paul Railway |
| Idaho and Western Railway
|
|MILW
|1909
|1912
|Chicago, Milwaukee and Puget Sound Railway |
| Intermountain Railway
|
|
|1907
|1935
|N/A |
| Kootenai Valley Railway
|
|GN
|1898
|1913
|Great Northern Railway |
| Lake Creek and Coeur d'Alene Railroad
|
|UP
|1906
|1910
|Oregon–Washington Railroad and Navigation Company |
| Lewiston, Nezperce and Eastern Railroad
|
|
|1915
|1924
|N/A |
| Malad Valley Railroad
|
|UP
|1902
|1910
|Oregon Short Line Railroad |
| Milner and North Side Railroad
|
|
|1907
|1915
|N/A |
| Minidoka and Southwestern Railroad
|
|UP
|1904
|1910
|Oregon Short Line Railroad |
| Nezperce Railroad
|NEZP
|
|1945
|1983
|N/A |
| Nez Perce and Idaho Railroad
|
|
|1917
|1946
|Nezperce Railroad |
| Nez Perce and Idaho Railroad
|
|
|1908
|1915
|Lewiston, Nezperce and Eastern Railroad |
| Northern Pacific Railroad
|
|NP
|1864
|1896
|Northern Pacific Railway |
| Northern Pacific Railway
|NP
|NP
|1896
|1970
|Burlington Northern Inc. |
| Ohio Match Company Railway
|
|SI
|1903
|1944
|Converted into roads. |
| Oregon Railroad and Navigation Company
|
|UP
|1896
|1910
|Oregon–Washington Railroad and Navigation Company |
| Oregon Railway and Navigation Company
|
|UP
|1884
|1896
|Oregon Railroad and Navigation Company |
| Oregon Short Line Railroad
|
|UP
|1897
|1987
|Union Pacific Railroad |
| Oregon Short Line Railway
|
|UP
|1882
|1889
|Oregon Short Line and Utah Northern Railway |
| Oregon Short Line and Utah Northern Railway
|
|UP
|1889
|1897
|Oregon Short Line Railroad |
| Oregon–Washington Railroad and Navigation Company
|
|UP
|1910
|1987
|Union Pacific Railroad |
| Oregon, Washington and Idaho Railroad
|
|UP
|1903
|1910
|Oregon–Washington Railroad and Navigation Company |
| Pacific and Idaho Northern Railway
|P&IN
|UP
|1899
|1936
|Oregon Short Line Railroad |
| Palouse River and Coulee City Railroad
|PCC
|
|1996
|2006
|Washington and Idaho Railway |
| Payette Valley Railroad
|
|UP
|1906
|1914
|Oregon Short Line Railroad |
| Payette Valley Extension Railroad
|
|UP
|1910
|1914
|Oregon Short Line Railroad |
| St. Anthony Railroad
|
|UP
|1899
|1910
|Oregon Short Line Railroad |
| Salmon River Railroad
|
|UP
|1901
|1910
|Oregon Short Line Railroad |
| Salt Lake and Idaho Railroad
|
|UP
|1909
|1914
|Oregon Short Line Railroad |
| San Francisco, Idaho and Montana Railway
|
|UP
|1905
|1909
|Oregon Short Line Railroad |
| Spokane, Coeur d'Alene and Palouse Railway
|
|GN
|1926
|1943
|Great Northern Railway
|Electric until 1941 |
| Spokane Falls and Idaho Railroad
|
|NP
|1886
|1898
|Northern Pacific Railway |
| Spokane International Railroad
|SI
|UP
|1941
|1987
|Union Pacific Railroad |
| Spokane International Railway
|
|UP
|1905
|1941
|Spokane International Railroad |
| Spokane and Palouse Railway
|
|NP
|1886
|1898
|Northern Pacific Railway |
| Utah Northern Railroad
|
|UP
|1872
|1878
|Utah and Northern Railway |
| Utah and Northern Railway
|
|UP
|1878
|1889
|Oregon Short Line and Utah Northern Railway |
| Wallace and Sunset Railroad
|
|NP
|1890
|1898
|Northern Pacific Railway |
| Washington and Idaho Railroad
|
|UP
|1886
|1896
|Oregon Railroad and Navigation Company |
| Washington, Idaho and Montana Railway
|WIM
|MILW
|1905
|1980
|Burlington Northern Inc. |
| Weiser, Idaho and Spokane Railway
|
|UP
|
|1899
|Pacific and Idaho Northern Railway |
| Yellowstone Park Railroad
|
|UP
|1905
|1910
|Oregon Short Line Railroad |