| Abbreviation | Meaning | Notes |
|---|---|---|
| ??? | Unknown | |
| Army Ord. | US Army Ordinance | |
| ATK | Amtrak | |
| AT&SF | Atchison, Topeka, & Santa Fe Railway | |
| BE&S | Blackwell, Enid, & Southwestern | Affiliated with the DE&G and known as the "Bes Line", sold to Frisco in July of 1907. Constructed trackage south from Blackwell, OK to Vernon, TX; today Farmrail operates the portion from Enid, OK to Davidson, OK (north of Red River), while the Enid-Blackwell portion was abandoned by the BN. |
| BN | Burlington Northern | |
| B/D | Builder's Date | |
| B/N | Builder's Number | |
| Bag | Baggage Car | |
| Biz Car | Business car | |
| BM&E | Beaver, Meade, & Englewood | Incorporated June 12, 1912 in Oklahoma. It constructed trackage from Beaver, OK to Keyes, OK (via Forgan) between 1915 and 1930. Sold to Missouri-Kansas-Texas on April 2, 1931. All trackage was abandoned on or before October 16, 1972. |
| CofC | Chamber of Commerce | |
| CofD | City of Dallas | |
| CO&G | Choctaw, Oklahoma, & Gulf Railroad | Leased to RI in March 1904, merged with RI in 1948. |
| CORC | Central Oklahoma Railfan Club | NRHS chapter based in Oklahoma City. |
| C&NW | Chicago & North Western | |
| CRI&P | Chicago, Rock Island, and Pacific | |
| C&S | Colorado & Southern Railway | |
| C&OW | Clinton & Oklahoma Western Railroad | Shortline acquired by the Santa Fe in June, 1928. It was formed on April 10, 1920 by the purchase of the Clinton & Oklahoma Western Railway and the Cheyenne Railroad (eariler the Cheyenne Short Line Railroad). Its trackage extended from Clinton to Cheyenne, but in 1929, the Santa Fe extended the line from Cheyenne to Pampa, TX. |
| CN | CN Rail/Canadian National | |
| CRCo | Cushing Rail Car Co. | Former railcar repair company in Cushing. |
| DL&CCo | Dierks Lumber & Coal Company | Changed name to Dierks Forest in 1954, and was acquired in September 1969 by Weyerhaeuser. |
| EP | Eagle-Pitcher Co | Mining company operating in the tri-state lead and zinc district. |
| FMRC | Farmrail Corporation | Shortline operating on former Frisco trackage in western Oklahoma. |
| FW&D | Fort Worth and Denver | |
| GNBC | Grainbelt Corporation | Shortline operating on former Rock Island and Santa Fe trackage in western Oklahoma. |
| GNG | German narrow gauge | |
| HW | Heavyweight passenger car | |
| KCM&O | Kansas City, Mexico & Orient Railway | Organized by Arthur Stillwell to build a railroad from Kansas City to the Pacific at Topolobampo, Mexico. Santa Fe purchased the line on August 1, 1929. |
| KO&G | Kansas, Oklahoma, & Gulf Railway | |
| KRR | Kiamichi Railroad | Operator of former BN/Frisco lines, headquartered in Hugo, OK. |
| LW | Lightweight passenger car | |
| MET | Muskogee Electric Traction | |
| MKT | Missouri-Kansas-Texas - "The Katy" | |
| MP | Missouri Pacific | |
| MV | Midland Valley Railway | |
| MWTS | Midwest Travel Service | Private car owner/trip operator in Oklahoma City. |
| NEO | Northeast Oklahoma Railway | Abandoned Interurban in extreme northeastern Oklahoma and southeastern Kansas, acquired by the Frisco in January 1964. |
| NP | Northern Pacific Railway | |
| OC | Oklahoma Cental | |
| OCAA | Oklahoma City-Ada-Atoka Railway | Created on May 1, 1924 by the purchase of the Missouri, Kansas, & Texas Railway's trackage between Shawnee and Coalgate and the lease of the Oklahoma City-Shawnee Interurban Railway between Oklahoma City and Shawnee. On April 2, 1929, the Muskogee Company which controled the MV and KO&G acquired control, and on May 1, 1930, the Oklahoma City-Shawnee Interuban was purchased by the OCAA. In 1964, the OCAA was sold to the AT&SF. |
| O-SW | Oklahoma-Southwestern | Abandoned railroad in Creek County, built from a connection with the Frisco at Bristow southeast towards Slick. The line was originally intended to go as far as Okmulgee, but due to the decline of the Slick Oil Field, the line only reached Nuyaka. |
| OG&E | Oklahoma Gas & Electric | |
| ONM&P | Oklahoma, New Mexico, & Pacific | Line constucted west of Ardmore to Ringling; Santa Fe acquired the line in the 1920's. |
| ORyCo | Oklahoma Railway | Abandoned interurban operating both city lines in Oklahoma City and lines to Guthrie, Norman, and El Reno. The last interurban run was made September 27, 1947 on the Norman line, and freight operations were sold jointly to the Santa Fe and the Rock Island. |
| OUR | Oklahoma Union Railway | Abandoned Tulsa city trolley line. |
| PCRy | Pittsburg County Railway | Interurban located near McAlester; line abandoned 1947. |
| SKOL | South Kansas & Oklahoma RR | Shortline operating in Kansas and Oklahoma on former Santa Fe trackage. |
| SLPR-LNGE | Sleeper-Lounge | |
| SLSF | St. Louis-San Francisco Railway - Frisco | |
| SS | Sand Springs Railway | Interurban built by Charles Page, extending from Tulsa to Sand Springs. Interurban service ceased in 1955. |
| TO&E | Texas, Oklahoma & Eastern | Former Dierks logging railroad in southeast Oklahoma; now operated by Weyerhaeuser. |
| TSR | Tulsa Street Railway | Abandoned Tulsa city trolley line. |
| TSU | Tulsa-Sapulpa Union Railway | Shortline operating from Tulsa to Sapulpa. It was built as an interurban extension of the Oklahoma Union Railway Company from Tulsa to Sapulpa. After the abandonment of the Tulsa city lines, the OUR continued as a freight hauler. It operated as the Union Railway from September 1933 to January 1934, when it became the Sapulpa Union Railway. In 1943, the name was changed to Tulsa-Sapulpa Union Railway. |
| UE | Union Electric | Interurban operating in Southeast Kansas and Northeast Oklahoma from Nowata, OK to Parsons, KS via Coffeyville and Independence. Passenger runs ceased on July 17, 1947 and the line was abandoned in June 1948. |
| UP | Union Pacific |
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