<!-- "none" is a legitimate description when the title is already adequate; see WP:SDNONE -->
thumb|220px|The location of the in the .|alt=A map showing the location of the U.S. State of Colorado.
This list of Colorado railroads identifies the variety of active, historic, and defunct railroads in the U.S. State of Colorado.
__TOC__
Common freight carriers
- BNSF Railway Company (BNSF)
- Cimarron Valley Railroad L.C. (CVR)
- Colorado and Wyoming Railway Company (CW)
- Colorado Pacific Railroad LLC (CXR)
- Colorado Pacific Rio Grande Railroad LLC (CXRG)
- Colorado Pacific San Luis Railroad LLC (CXSL)
- The Denver Rock Island Railroad (DRIR)
- Great Western Railway of Colorado, L.L.C. (GWR)
- Hudson Terminal Rail Services, LLC (HTR)
- Kansas & Oklahoma Railroad, L.L.C. (KO)
- Keenesburg Direct Railroad (KDR)
- Kyle Railroad (KYLE)
- Nebraska, Kansas & Colorado Railway, LLC (NKCR)
- Rock & Rail LLC (RRRR)
- Union Pacific Railroad Company (UP)
- Utah Railway Company (UTAH)
Historic attraction carriers
- Cañon City & Royal Gorge Railroad, LLC (DBA Royal Gorge Route Railroad)
- Cripple Creek and Victor Narrow Gauge Railroad
- Cumbres and Toltec Scenic Railroad
- Durango & Silverton Narrow Gauge Railroad Company
- Fort Collins Municipal Railway
- Georgetown Loop Railroad
- Leadville, Colorado & Southern Railroad Co.
- Manitou and Pike's Peak Railway Company
- Platte Valley Trolley (Denver Tramway Heritage Society)
- Rio Grande Scenic Railroad
Private freight carriers
- Deseret Western Railway
- MillerCoors Brewery
- Rawhide Shortline
Passenger carriers
- Amtrak (AMTK)
- RTD Rail
- Colorado San Francisco and Northern LLC.
- Rockies to the Red Rocks (Rocky Mountaineer)
Defunct railroads
<!--Burlington and Missouri River Railroad in Nebraska? was the Georgetown and Gray's Peak Railway only a holding company? Inter-Mountain Railway between Denver and Inter-Mountain Railway and Denver and Inter-Mountain Railroad? Colorado Central Railroad http://www.rrb.gov/blaw/bcd/bcd02-63.html? Where the hell was the Colorado and Eastern Railroad?-->
{| class="wikitable sortable"
!Name
!Mark
!System
!From
!To
!Successor
!Notes
|-
|Argentine Central Railway
|
|
|1905
|1912
|Argentine and Gray's Peak Railway
|-
|Argentine and Gray's Peak Railway
|
|
|1913
|1918
|N/A
|-
|Arkansas Valley Railroad
|
|ATSF
|1900
|1907
|Atchison, Topeka and Santa Fe Railway
|-
|Aspen Short Line Railway
|
|
|1888
|1893
|Colorado Midland Railroad
|-
|Aspen and Western Railway
|
|
|1880
|1892
|Crystal River Railway
|-
|Associated Railroads
|none
|AT&SF, CB&Q (BN), CRI&P, C&S (BN) and D&RGW
|1953
|1988
|Regional Transportation District
|Consortium formed to operate former Denver and Inter-Mountain Railroad line to the Denver Federal Center. Service provided alternately by C&S (BN) and D&RGW on behalf of the other owning railroads. Line now part of the W Line.
|-
|Atchison, Topeka and Santa Fe Railroad
|
|ATSF
|1873<!--leased the Colorado and New Mexico Railroad-->
|1895
|Atchison, Topeka and Santa Fe Railway
|-
|Atchison, Topeka and Santa Fe Railway
|ATSF
|ATSF
|1895
|1996
|Burlington Northern and Santa Fe Railway
|-
|Beaver, Penrose and Northern Railway
|
|
|1909
|1920<!--?-->
|N/A
|-
|Book Cliff Railroad
|
|
|1899
|1925
|N/A
|-
|Burlington and Colorado Railroad
|
|CB&Q
|1881
|1908
|Chicago, Burlington and Quincy Railroad
|-
|Burlington Northern Inc.
|BN
|
|1970
|1981
|Burlington Northern Railroad
|-
|Burlington Northern Railroad
|BN
|
|1981
|1996
|Burlington Northern and Santa Fe Railway
|-
|Busk Tunnel Railway
|
|
|1890
|1900
|Colorado Midland Railway
|-
|Cadillac and Lake City Railway
|CLK
|
|1981<!--?-->
|1989
|N/A
|-
|Canon de Agua Railroad
|
|CB&Q
|1889
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Canon City and Cripple Creek Railroad
|
|
|1897<!--?-->
|1915<!--?-->
|N/A
|-
|Canon City and San Juan Railway
|
|ATSF
|1877
|1878
|Pueblo and Arkansas Valley Railroad
|-
|Canon Coal Railway
|
|DRGW
|1872
|1878
|Denver and Rio Grande Railway
|-
|Central Kansas Railway
|CKRY
|
|1997<!--leased west to Towner-->
|2001
|Kansas and Oklahoma Railroad
|-
|Chicago, Burlington and Quincy Railroad
|CB&Q
|CB&Q
|1881<!--leased the Burlington and Colorado Railroad (opened in 1882)-->
|1970
|Burlington Northern Inc.
|-
|Chicago, Burlington and Quincy Railway
|
|CB&Q
|1901
|1907
|N/A
|Leased the Chicago, Burlington and Quincy Railroad
|-
|Chicago, Kansas and Nebraska Railway
|
|RI
|1888
|1891
|Chicago, Rock Island and Pacific Railway
|-
|Chicago, Rock Island and Colorado Railway
|
|RI
|1888
|1888
|Chicago, Kansas and Nebraska Railway
|-
|Chicago, Rock Island and Pacific Railroad
|RI, ROCK
|RI
|1947
|1980
|Cadillac and Lake City Railway<!--not Denver Terminal - even that was initially C&LC-->
|-
|Chicago, Rock Island and Pacific Railway
|RI
|RI
|1888
|1948
|Chicago, Rock Island and Pacific Railroad
|-
|Chicosa Canon Railway
|
|CB&Q
|1889
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Clear Creek and Guy Gulch Wagon Road Company
|
|CB&Q
|1871
|1873
|Colorado Central Railroad
|-
|Colorado Railroad
|
|
|1938
|1957<!--?-->
|N/A
|-
|Colorado Railroad
|
|CB&Q
|1906
|1930
|Colorado and Southern Railway
|-
|Colorado Railway
|
|DRGW
|1883
|1888
|Denver and Rio Grande Railroad
|-
|Colorado Central Railroad
|
|CB&Q
|1869
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Colorado Central and Pacific Railroad
|
|CB&Q
|1866
|1869
|Colorado Central Railroad
|-
|Colorado and Clear Creek Railroad
|
|CB&Q
|1865
|1866
|Colorado Central and Pacific Railroad
|-
|Colorado Eastern Railroad
|
|
|1894
|1915
|N/A
|-
|Colorado Eastern Railway
|
|
|1888
|1894
|Colorado Eastern Railroad
|-
|Colorado–Kansas Railway
|
|
|1911
|1932
|Colorado Railroad
|-
|Colorado, Kansas and Pacific Railway
|CKP
|
|2000
|2003<!--?-->
|Towner Railway
|-
|Colorado Midland Railroad
|CM
|
|1917
|1921
|Midland Terminal Railway
|-
|Colorado Midland Railroad
|
|
|1893
|1897
|Colorado Midland Railway
|-
|Colorado Midland Railway
|
|
|1897
|1917
|Colorado Midland Railroad
|-
|Colorado Midland Railway
|
|
|1883
|1893
|Colorado Midland Railroad
|-
|Colorado and New Mexico Railroad
|
|ATSF
|1873
|1875
|Pueblo and Arkansas Valley Railroad
|-
|Colorado Northern Railway
|
|CB&Q
|1883
|1884
|Denver, Utah and Pacific Railroad
|-
|Colorado and Northwestern Railroad
|
|
|1904
|1909
|Denver, Boulder and Western Railroad
|-
|Colorado and Northwestern Railway
|
|
|1897
|1904
|Colorado and Northwestern Railroad
|-
|Colorado and Pacific Wagon, Telegraph and Railroad Company
|
|CB&Q
|1861
|1871
|Clear Creek and Guy Gulch Wagon Road Company
|-
|Colorado and Salt Lake Railroad
|
|CB&Q
|1871
|1872
|Colorado Central Railroad
|-
|Colorado and Southeastern Railroad
|C&SE
|
|1909
|1952<!--?-->
|N/A
|-
|Colorado and Southeastern Railway
|
|
|1903
|1909
|Colorado and Southeastern Railroad
|-
|Colorado and Southern Railway
|C&S, CS
|CB&Q
|1898
|1981
|Burlington Northern Railroad
|-
|Colorado Southwestern Railway
|
|DRGW
|1888
|1889
|Rio Grande Junction Railway
|-
|Colorado Springs and Cripple Creek District Railway
|CCD
|
|1899
|1920
|N/A
|-
|Colorado and Utah Railway
|
|
|1886
|1892
|Crystal River Railway
|-
|Colorado and Wyoming Railroad
|
|CB&Q
|1887
|1908
|Chicago, Burlington and Quincy Railroad
|-
|Colorado, Wyoming and Eastern Railway
|
|UP
|1914
|1924
|Northern Colorado and Eastern Railroad
|-
|Colorado, Wyoming and Great Northern Railroad
|
|
|1894
|1899<!--?-->
|Book Cliff Railroad
|-
|Cripple Creek and Colorado Springs Railroad
|
|
|1915
|1921
|Midland Terminal Railway
|-
|Cripple Creek District Railway
|
|
|1897
|1899
|Colorado Springs and Cripple Creek District Railway
|-
|Crystal River Railroad
|
|
|1898
|1941<!--?-->
|N/A
|-
|Crystal River Railway
|
|
|1892
|1898
|Crystal River Railroad
|-
|Crystal River and San Juan Railroad
|
|
|1906
|1941<!--?-->
|N/A
|-
|Denver Railroad and Land Company
|
|
|1886
|1887
|Denver Railroad, Land and Coal Company
|-
|Denver Railroad, Land and Coal Company
|
|
|1887
|1888
|Colorado Eastern Railway
|-
|Denver Railway
|DRWY
|
|1989
|1993
|Denver Rock Island Railroad
|-
|Denver and Boulder Valley Railroad
|
|UP
|1870
|1898
|Union Pacific Railroad
|-
|Denver, Boulder and Western Railroad
|
|
|1909
|1919
|N/A
|-
|Denver Circle Railroad
|
|ATSF
|1880
|1886
|Denver and Santa Fe Railway
|-
|Denver, Clear Creek and Western Railway
|
|DRGW
|1888
|1899
|Denver and Rio Grande Railroad
|-
|Denver, Cripple Creek and Southwestern Railroad
|
|CB&Q
|1896
|1899
|Colorado and Southern Railway
|-
|Denver, Golden and Salt Lake Railroad
|
|CB&Q
|1881
|1917
|Chicago, Burlington and Quincy Railroad
|-
|Denver and Inter-Mountain Railroad
|D&IM, DIM
|
|1909
|1953
|Associated Railroads (AT&SF, CB&Q, CRI&P, C&S and D&RGW)
|Electric after 1909<!--?-->
|-
|Denver and Inter-Mountain Railway
|
|
|1904
|1909<!--?-->
|Denver and Inter-Mountain Railroad
|-
|Denver, Lakewood and Golden Railroad
|
|
|1890
|1904<!--?-->
|Denver and Inter-Mountain Railway
|-
|Denver, Laramie and Northern Railroad
|
|
|1917
|1917
|Great Western Railway of Colorado
|-
|Denver, Laramie and Northwestern Railroad
|
|
|1910<!--?-->
|1917
|Denver, Laramie and Northern Railroad
|-
|Denver, Laramie and Northwestern Railway
|
|
|1906
|1910<!--?-->
|Denver, Laramie and Northwestern Railroad
|-
|Denver, Leadville and Gunnison Railway
|
|CB&Q
|1889
|1898
|Colorado and Southern Railway
|-
|Denver, Longmont and Northwestern Railroad
|
|CB&Q
|1881
|1883
|Colorado Northern Railway
|-
|Denver, Marshall and Boulder Railway
|
|CB&Q
|1885
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Denver and Middle Park Railroad
|
|CB&Q
|1883
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Denver and Montana Railroad
|
|CB&Q
|1899
|1908
|Chicago, Burlington and Quincy Railroad
|-
|Denver and New Orleans Railroad
|
|CB&Q
|1881
|1886
|Denver, Texas and Gulf Railroad
|-
|Denver, Northwestern and Pacific Railway
|
|DRGW
|1902
|1913
|Denver and Salt Lake Railroad
|-
|Denver Pacific Railway and Telegraph Company
|
|UP
|1867
|1880
|Union Pacific Railway
|-
|Denver and Rio Grande Railroad
|
|DRGW
|1886
|1921
|Denver and Rio Grande Western Railroad
|-
|Denver and Rio Grande Railway
|
|DRGW
|1870<!--or 1864??-->
|1886
|Denver and Rio Grande Railroad
|-
|Denver and Rio Grande Western Railroad
|D&RG, D&RGW, DRGW
|DRGW
|1920
|1997
|Union Pacific Railroad
|-
|Denver and Salt Lake Railroad
|D&SL
|DRGW
|1912
|1927
|Denver and Salt Lake Railway
|-
|Denver and Salt Lake Railway
|D&SL
|DRGW
|1926
|1947
|Denver and Rio Grande Western Railroad
|-
|Denver and Salt Lake Western Railroad
|
|DRGW
|1924<!--?-->
|1947
|Denver and Rio Grande Western Railroad
|-
|Denver and Santa Fe Railway
|
|ATSF
|1887
|1900
|Atchison, Topeka and Santa Fe Railway
|-
|Denver, South Park and Hill Top Railway
|
|CB&Q
|1896
|1897
|Denver, Leadville and Gunnison Railway
|-
|Denver, South Park and Pacific Railroad
|
|CB&Q
|1873
|1889
|Denver, Leadville and Gunnison Railway
|-
|Denver, South Park and Pacific Railway
|
|CB&Q
|1872
|1873
|Denver, South Park and Pacific Railroad
|-
|Denver and Southwestern Railway
|
|
|1899
|1904
|Cripple Creek Central Railway (holding company)
|-
|Denver Terminal Railroad
|DTMR
|
|1986<!--??-->
|1989
|Denver Railway
|-
|Denver, Texas and Gulf Railroad
|
|CB&Q
|1885
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Denver, Texas and Fort Worth Railroad
|
|CB&Q
|1887
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Denver Union Railway and Terminal Company
|
|UP
|1889
|1900
|Union Pacific Railroad
|-
|Denver Union Terminal Railway
|DUT
|ATSF/ CB&Q/ DRGW/ RI/ UP
|1912
|2001
|Regional Transportation District
|-
|Denver, Utah and Pacific Railroad
|
|CB&Q
|1880
|1908
|Chicago, Burlington and Quincy Railroad
|-
|Denver, Western and Pacific Railway
|
|CB&Q
|1880
|1885
|Denver, Marshall and Boulder Railway
|-
|Elk Mountain Railway
|
|
|1887
|1898
|Crystal River Railroad
|-
|Florence and Cripple Creek Railroad
|
|
|1893
|1915
|Cripple Creek and Colorado Springs Railroad
|-
|Fort Collins Development Railway
|
|CB&Q
|1902
|1908
|Colorado Railroad
|-
|Fort Worth and Denver Railway
|FWD
|CB&Q
|1881<!--leased ex-C&S from BN-->
|1982
|Burlington Northern Railroad
|-
|Georgetown, Breckenridge and Leadville Railway
|
|CB&Q
|1881
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Gilpin Railroad
|
|CB&Q
|1909
|1917
|N/A
|-
|Gilpin Tramway Company
|
|CB&Q
|1886
|1906
|Gilpin Railroad
|-
|Golden Circle Railroad
|
|
|1896
|1915
|Cripple Creek and Colorado Springs Railroad
|-
|Golden City and Gilpin County Wagon and Railroad Company
|
|CB&Q
|1870
|1872
|Colorado Central Railroad
|-
|Golden City and South Platte Railway and Telegraph Company
|
|
|1872
|1880<!--??-->
|N/A
|-
|Grand Valley Railway
|
|DRGW
|1886
|1887
|Denver and Rio Grande Railroad
|-
|Greeley, Salt Lake and Pacific Railway
|
|CB&Q
|1881
|1890
|Union Pacific, Denver and Gulf Railway
|-
|Greeley Terminal Railway
|
|
|1909<!--?-->
|1917
|N/A
|-
|Holly and Swink Railway
|
|ATSF
|1906
|1907
|Atchison, Topeka and Santa Fe Railway
|-
|Kansas–Colorado Railroad
|
|
|1908
|1910
|Colorado–Kansas Railway
|-
|Kansas Pacific Railway
|
|UP
|1869
|1880
|Union Pacific Railway
|-
|Laramie, Hahns Peak and Pacific Railway
|
|UP
|1911<!--leased the completed Larimer and Routt County Railway-->
|1914
|Colorado, Wyoming and Eastern Railway
|-
|Laramie, North Park and Western Railroad
|
|UP
|1924
|1951
|Union Pacific Railroad
|-
|Larimer and Routt County Railway
|
|UP
|1907
|1914
|Colorado, Wyoming and Eastern Railway
|-
|Leadville Mineral Belt Railway
|
|CB&Q
|1898
|1900
|Colorado and Southern Railway
|-
|Leadville, Ten Mile and Breckenridge Railway
|
|DRGW
|1880
|1880
|Denver and Rio Grande Railway
|-
|Little Book Cliff Railway
|
|
|1889
|1894<!--?-->
|Colorado, Wyoming and Great Northern Railroad
|-
|London, South Park and Leadville Railroad
|
|
|1882
|1885
|South Park and Leadville Short Line Railroad
|-
|Longmont and Erie Railroad
|
|CB&Q
|1878
|1881
|Denver, Longmont and Northwestern Railroad
|-
|Midland Terminal Railway
|MTR
|
|1892
|1949
|N/A
|-
|Missouri Pacific Railroad
|MP
|MP
|1917
|1997
|Union Pacific Railroad
|-
|Missouri Pacific Railway
|
|MP
|1887<!--leased the Pueblo and State Line Railroad-->
|1917
|Missouri Pacific Railroad
|-
|Mount Carbon, Gunnison and Lake City Railroad and Coal Transportation Company
|
|CB&Q
|1877
|1881
|Denver, South Park and Pacific Railroad
|-
|Nebraska, Kansas and Colorado RailNet
|NKCR
|
|1996
|2005
|Nebraska Kansas Colorado Railway
|-
|Northern Colorado and Eastern Railroad
|
|UP
|1924
|1924
|Laramie, North Park and Western Railroad
|-
|Northwestern Terminal Railroad
|
|DRGW
|1927
|1968
|Denver and Rio Grande Western Railroad
|-
|Northwestern Terminal Railway
|
|DRGW
|1904
|1927
|Northwestern Terminal Railroad
|-
|Platt<!--sic--> Valley Railway
|
|
|1993
|1993
|Denver Rock Island Railroad
|-
|Pueblo and Arkansas Valley Railroad
|
|ATSF
|1875
|1900
|Atchison, Topeka and Santa Fe Railway
|-
|Pueblo and Salt Lake Railway
|
|ATSF
|1873
|1875
|Pueblo and Arkansas Valley Railroad
|-
|Pueblo and State Line Railroad
|
|MP
|1887
|1910
|Missouri Pacific Railway
|-
|Pueblo Union Depot and Railroad Company
|
|ATSF/ CB&Q/ DRGW/ MP/ RI
|1887
|<!--no idea-->
|
|-
|Rio Grande Railroad
|
|DRGW
|1900
|1908
|Denver and Rio Grande Railroad
|-
|Rio Grande Gunnison Railway
|
|DRGW
|1891
|1908
|Denver and Rio Grande Railroad
|-
|Rio Grande Junction Railway
|
|DRGW
|1889
|1947
|Denver and Rio Grande Western Railroad
|-
|Rio Grande, Pagosa and Northern Railroad
|
|DRGW
|1899
|1908
|Denver and Rio Grande Railroad
|-
|Rio Grande and Pagosa Springs Railroad
|
|
|1895
|1914
|N/A
|-
|Rio Grande, Pueblo and Southern Railroad
|
|DRGW
|1902
|1908
|Denver and Rio Grande Railroad
|-
|Rio Grande Sangre de Cristo Railroad
|
|DRGW
|1901
|1908
|Denver and Rio Grande Railroad
|-
|Rio Grande Southern Railroad
|
|DRGW
|1889
|1951
|N/A
|-
|Rio Grande Western Railway
|
|DRGW
|1889
|1908
|Denver and Rio Grande Railroad
|-
|Road Canon Railroad
|
|CB&Q
|1889
|1890
|Union Pacific, Denver and Gulf Railway
|-
|St. Joseph and Iowa Railroad
|
|RI
|1888<!--leased the Chicago, Kansas and Nebraska Railway-->
|1888
|Chicago, Rock Island and Pacific Railway
|-
|San Luis Southern Railway
|
|
|1909
|1928<!--or 1955??-->
|San Luis Valley Southern Railway
|-
|San Luis Valley Southern Railway
|
|
|1928
|1953
|Southern San Luis Valley Railroad
|-
|Silverton Railroad
|
|
|1887
|1904
|Silverton Railway
|-
|Silverton Railway
|
|
|1904
|1922<!--?-->
|N/A
|-
|Silverton, Gladstone and Northerly Railroad
|
|
|1899
|1915
|Silverton Northern Railroad
|-
|Silverton Northern Railroad
|
|
|1895
|1941
|N/A
|-
|South Park and Leadville Short Line Railroad
|
|
|1885
|1900
|N/A
|-
|Southern San Luis Valley Railroad
|SSLV
|
|1953
|1996<!--??-->
|N/A
|-
|State Line and Denver Railway
|
|DRGW
|1889
|1889
|Rio Grande Western Railway
|-
|Trinidad Railway
|TRIN
|
|1992
|
|
|Still exists as a joint lessor of the BNSF Railway and Union Pacific Railroad
|-
|Trinidad and Denver Railroad
|
|DRGW
|1886
|1888
|Denver and Rio Grande Railroad
|-
|Trinidad and Denver Terminal and Railway Company
|
|DRGW
|1888
|1899
|Denver and Rio Grande Railroad
|-
|Uintah Railway
|
|
|1903
|1939
|N/A
|-
|Union Depot and Railroad Company
|
|ATSF/ CB&Q/ DRGW/ RI/ UP
|1879
|1899
|Union Depot and Railway Company
|-
|Union Depot and Railway Company
|
|ATSF/ CB&Q/ DRGW/ RI/ UP
|1899
|1914
|Denver Union Terminal Railway
|-
|Union Pacific Railway
|
|UP
|1880
|1898<!--?-->
|Union Pacific Railroad
|-
|Union Pacific Railway, Eastern Division
|
|UP
|1866<!--authorized to enter Colorado-->
|1869
|Kansas Pacific Railway
|-
|Union Pacific, Denver and Gulf Railway
|
|CB&Q
|1890
|1898
|Colorado and Southern Railway
|-
|Union Pacific, Lincoln and Colorado Railway
|
|UP
|1888
|1898
|N/A
|Sold at foreclosure; no property in Colorado
|-
|Walsenburg and Western Railway
|
|CB&Q
|1907
|1910
|Colorado Railroad
|}
;Electric
- Arkansas Valley Railway, Light and Power Company
- Boulder Electric Light and Power Company
- Canon City and Cripple Creek Railroad
- Colfax Electric Railway
- Colorado Railway, Light and Power Company
- Colorado Springs and Cripple Creek District Railway (CCD)
- Colorado Springs and Interurban Railway
- Colorado Springs Rapid Transit Company
- Colorado Springs and Suburban Railway
- Cripple Creek District Railway
- Denver City Cable Railway
- Denver City Traction Company
- Denver City Tramway Company
- Denver Consolidated Tramway Company
- Denver Electric and Cable Railway
- Denver, Globeville and Golden Rapid Transit Company
- Denver and Inter-Mountain Railroad (D&IM, DIM)
- Denver and Inter-Mountain Railway
- Denver and Interurban Railroad
- Denver, Lakewood and Golden Railroad
- Denver and Northwestern Railway
- Denver and South Platte Railway
- Denver Tramway Company
- Denver Tramway Extension Company
- Denver Tramway Terminals Company
- Durango Railway and Realty Company
- Florence and Cripple Creek Railroad
- Fort Collins Municipal Railway
- Grand Junction Electric Railway
- Grand Junction and Grand River Valley Railway
- Grand River Valley Railway
- Greeley and Denver Railroad
- Manitou Incline Railway
- Metropolitan Railway
- Midland Terminal Railway
- Pueblo and Suburban Traction and Lighting Company
- Southern Colorado Power and Railway Company
- South Denver Cable Railway
- Trinidad Electric Transmission, Railway and Gas Company
- West End Street Railroad
See also
- Transportation in Colorado
- List of Denver RTD rail stations
- List of tunnels documented by the Historic American Engineering Record in Colorado
- Bibliography of Colorado
- Geography of Colorado
- History of Colorado
- Index of Colorado-related articles
- List of Colorado-related lists
- Outline of Colorado