AOK
| Arkansas-Oklahoma Railroad | 65 |
ATW
| Atlantic and Western | 39 |
BCDL
| BCDL | 1 |
BCOL
| Canadian National Railways | 8 |
BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 329 |
CAGY
| Columbus & Greenville Railway | 2 |
CHTT
| Chicago Heights Terminal Transfer | 4 |
CN
| Canadian National Railways | 22 |
CNIS
| Canadian National Railways | 1 |
COER
| Crab Orchard & Egyptian | 30 |
CRLE
| Coe Rail Incorporated | 6 |
DWC
| Canadian National Railways | 12 |
GMRC
| Green Mountain RR | 2 |
GNRR
| Georgia Northeastern | 1 |
GTW
| Grand Trunk Western | 4 |
HE
| Hollis and Eastern Railroad Company | 11 |
HLSC
| Hampton Railway Incorporated | 11 |
IC
| Illinois Central | 5 |
KCS
| Kansas City Southern | 1 |
LRS
| Laurinburg and Southern | 1 |
LW
| Louisville and Wadley Railway Company | 7 |
NDYX
| First Union Rail | 13 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 2 |
NOKL
| Northwestern Oklahoma | 53 |
NRLX
| CIT Group/Capital Finance, Inc | 7 |
NS
| Norfolk Southern | 6 |
SCOL
| SCOL | 1 |
SERA
| Sierra Northern Railway | 1 |
SGLR
| Seminole Gulf | 1 |
SMW
| St Marys Railway West LLC | 3 |
SOO
| Soo Line | 12 |
SRY
| Southern Railway of British Columbia Lim | 16 |
TNER
| Texas Northeastern Division Mid-Michigan | 1 |
TR
| Tomahawk Railway L.P. | 169 |
TTX
| TTX Company | 1 |
TTZX
| TTX Company-Centerbeam Flats | 382 |
UCRY
| Utah Central | 1 |
UP
| Union Pacific Railroad Company | 29 |
WC
| Wisconsin Central | 16 |
WCRC
| Washington Central | 22 |
WRWK
| Providence & Worchester Railroad | 4 |