AOK
| Arkansas-Oklahoma Railroad | 4 |
ATW
| Atlantic and Western | 1 |
BCOL
| Canadian National Railways | 9 |
BNSF
| BNSF Railway | 9 |
BR
| Buffalo and Pittsburgh | 1 |
CN
| Canadian National Railways | 5 |
COER
| Crab Orchard & Egyptian | 2 |
CSX
| CSX Railroad | 16 |
DWC
| Canadian National Railways | 6 |
FURX
| First Union Rail | 6 |
HLSC
| Hampton Railway Incorporated | 1 |
IANR
| Iowa Northern Ry | 1 |
IC
| Illinois Central | 1 |
KLRX
| KOCH RAIL LLC | 1 |
LRWN
| Little Rock & Western | 1 |
MMA
| Montreal, Maine & Atlantic | 2 |
NDYX
| First Union Rail | 10 |
NOKL
| Northwestern Oklahoma | 3 |
NRLX
| CIT Group/Capital Finance, Inc | 4 |
SMW
| St Marys Railway West LLC | 2 |
SOO
| Soo Line | 8 |
TR
| Tomahawk Railway L.P. | 3 |
TTZX
| TTX Company-Centerbeam Flats | 75 |
UP
| Union Pacific Railroad Company | 4 |
WC
| Wisconsin Central | 3 |
WCRC
| Washington Central | 1 |
WRWK
| Providence & Worchester Railroad | 3 |