ARR
| Alaska Railroad | 8 |
ATSF
| Atchison Topeka & Santa Fe | 12 |
BLE
| Bessemer & Lake Erie | 2 |
BN
| Burlington Northern | 6 |
BNSF
| BNSF Railway | 1 |
CBQ
| Chicago Burlington & Quincy | 1 |
CNW
| Chicago & Northwestern | 7 |
CR
| Conrail | 7 |
CSX
| CSX Railroad | 9 |
CYDX
| Conrad Yelvington Distributors | 1 |
DRGW
| Denver & Rio Grande Western | 32 |
FRKX
| Florida Rock Industries | 1 |
GLIX
| GLIX | 2 |
IC
| Illinois Central | 1 |
MP
| Missouri Pacific | 76 |
MWAX
| Martin Marietta Materials Incorporated | 10 |
MWCX
| Midwest Railcar Corporation | 1 |
NERR
| Nashville and Eastern | 1 |
NS
| Norfolk Southern | 2 |
NYC
| New York Central | 2 |
PKTX
| Citizens Gas & Coke Utility | 1 |
PMRX
| Progress Metal Reclamation Company | 4 |
PSR
| Pittsburg and Shawmut Railroad Incorporated | 5 |
RBMN
| Reading Blue Mountain & Northern | 14 |
SOU
| Southern | 1 |
UP
| Union Pacific Railroad Company | 2 |
VULX
| Vulcan Materials | 1 |
WFRX
| WELLS FARGO RAIL CORPORATION | 2 |