ABOX
| TTX Company | 2 |
AGR
| Alabama and Gulf Coast | 3 |
AOK
| Arkansas-Oklahoma Railroad | 2 |
ATW
| Atlantic and Western | 4 |
BAR
| Bangor & Aroostook | 5 |
BCOL
| Canadian National Railways | 2 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 1 |
CN
| Canadian National Railways | 4 |
CNA
| Canadian National Railways | 1 |
CP
| Canadian Pacific Railway | 1 |
CRLE
| Coe Rail Incorporated | 2 |
CSX
| CSX Railroad | 13 |
EEC
| East Erie Commercial Railroad | 7 |
FBOX
| TTX Company | 1 |
FLOX
| CIT Group/Capital Finance, Inc | 2 |
FSRR
| FerroSur | 2 |
GMRC
| Green Mountain RR | 13 |
GVSR
| Galveston Railroad L.P. | 1 |
HS
| H and S Railroad Company | 3 |
IBT
| International Bridge and Terminal Company | 1 |
IC
| Illinois Central | 1 |
KCS
| Kansas City Southern | 1 |
LW
| Louisville and Wadley Railway Company | 2 |
MCER
| Massachusetts Central Railroad | 14 |
MDR
| Kansas City Southern | 1 |
MDW
| Minnesota Dakota and Western Railway Com | 1 |
MEC
| Maine Central | 2 |
MMA
| Montreal, Maine & Atlantic | 24 |
MRL
| Montana Rail Link | 1 |
NOKL
| Northwestern Oklahoma | 2 |
NOPB
| New Orleans Public Belt Railroad | 2 |
NS
| Norfolk Southern | 2 |
OAR
| Old Augusta Railroad | 2 |
ONT
| Ontario Northland Railway | 4 |
PVRR
| Pioneer Valley Railroad Company Incorporated | 3 |
RBOX
| Railbox Company | 3 |
SBD
| Seaboard System | 2 |
SLC
| San Luis Central Railroad Company | 2 |
SLGG
| Progress Rail Services Corporation | 3 |
SOU
| Southern | 3 |
SP
| Southern Pacific | 2 |
SRN
| Sabine River & Northern | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
UP
| Union Pacific Railroad Company | 1 |
WC
| Wisconsin Central | 3 |
WCCL
| Wisconsin Central | 3 |
YKR
| York Rail | 2 |