| 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 |