ABOX
| TTX Company | 2 |
AGR
| Alabama and Gulf Coast | 3 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
BCLR
| Bay Colony | 1 |
BKTY
| Union Pacific Railroad Company | 13 |
BM
| Boston & Maine | 1 |
BNSF
| BNSF Railway | 1 |
CMHX
| CarMath Incorporated | 1 |
CN
| Canadian National Railways | 1 |
CNA
| Canadian National Railways | 2 |
CNIS
| Canadian National Railways | 1 |
COER
| Crab Orchard & Egyptian | 1 |
CP
| Canadian Pacific Railway | 5 |
CR
| Conrail | 1 |
CSX
| CSX Railroad | 30 |
DWC
| Canadian National Railways | 2 |
EEC
| East Erie Commercial Railroad | 1 |
FBOX
| TTX Company | 4 |
FSRR
| FerroSur | 1 |
FXE
| Ferromex | 2 |
GMRC
| Green Mountain RR | 1 |
GTW
| Grand Trunk Western | 1 |
HS
| H and S Railroad Company | 4 |
IANR
| Iowa Northern Ry | 1 |
IBT
| International Bridge and Terminal Company | 4 |
KCS
| Kansas City Southern | 7 |
LRS
| Laurinburg and Southern | 2 |
LRWN
| Little Rock & Western | 1 |
LW
| Louisville and Wadley Railway Company | 1 |
MEC
| Maine Central | 1 |
MP
| Missouri Pacific | 3 |
MQT
| Marquette Rail | 1 |
NADX
| General Electric Rail Services | 3 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 1 |
NOKL
| Northwestern Oklahoma | 2 |
NS
| Norfolk Southern | 8 |
NYC
| New York Central | 17 |
RBOX
| Railbox Company | 10 |
SOU
| Southern | 4 |
SP
| Southern Pacific | 3 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TBOX
| TTX Company | 17 |
TR
| Tomahawk Railway L.P. | 2 |
UP
| Union Pacific Railroad Company | 1 |
WC
| Wisconsin Central | 4 |
WFRX
| WELLS FARGO RAIL CORPORATION | 1 |
WP
| Western Pacific | 1 |
WRWK
| Providence & Worchester Railroad | 1 |
WTRM
| Warren and Trumbull Railroad Company | 1 |