| Name |
Mark |
System[nb 1] |
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. |
| 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 |
| St. Paul, Minneapolis and Manitoba Railway |
|
GN |
1879 |
1907 |
Great Northern Railway |
| 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 |