AKMD
| Arkansas Midland Railroad Company | 1 |
AM
| Arkansas & Missouri | 1 |
AOK
| Arkansas-Oklahoma Railroad | 4 |
ATW
| Atlantic and Western | 2 |
BCOL
| Canadian National Railways | 6 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 3 |
BR
| Buffalo and Pittsburgh | 2 |
CN
| Canadian National Railways | 2 |
CNA
| Canadian National Railways | 2 |
COER
| Crab Orchard & Egyptian | 1 |
DWC
| Canadian National Railways | 3 |
FDDM
| Fort Dodge Des Moines & Southern | 1 |
GAEX
| General American Marks Company | 3 |
GNRR
| Georgia Northeastern | 2 |
GTW
| Grand Trunk Western | 2 |
HLSC
| Hampton Railway Incorporated | 1 |
HPTX
| HAMPTON CAPITAL LLC | 1 |
IANR
| Iowa Northern Ry | 1 |
IC
| Illinois Central | 4 |
KLRX
| KOCH RAIL LLC | 2 |
LRWN
| Little Rock & Western | 1 |
MDS
| Meridian Southern Railway, LLC | 1 |
MSRC
| Kansas City Southern | 6 |
NOKL
| Northwestern Oklahoma | 6 |
NS
| Norfolk Southern | 7 |
RVPR
| Riverport R.R., L.L.C. | 1 |
SMW
| St Marys Railway West LLC | 2 |
SOO
| Soo Line | 6 |
SWM
| SWM | 1 |
TR
| Tomahawk Railway L.P. | 1 |
TTZX
| TTX Company-Centerbeam Flats | 4 |
UCIR
| Union County Industrial Railroad | 1 |
UP
| Union Pacific Railroad Company | 2 |
WC
| Wisconsin Central | 3 |
WRWK
| Providence & Worchester Railroad | 2 |