ABOX
| TTX Company | 1 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
ATW
| Atlantic and Western | 6 |
AZER
| Arizona Eastern Railway Company | 1 |
BKTY
| Union Pacific Railroad Company | 36 |
BLHX
| SMBC RAIL SERVICES LLC | 1 |
BNSF
| BNSF Railway | 21 |
CMHX
| CarMath Incorporated | 2 |
CNW
| Chicago & Northwestern | 1 |
COER
| Crab Orchard & Egyptian | 5 |
CP
| Canadian Pacific Railway | 8 |
CRIX
| Citicorp Railmark, Inc. | 2 |
CRLE
| Coe Rail Incorporated | 1 |
CSX
| CSX Railroad | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
DWC
| Canadian National Railways | 2 |
EEC
| East Erie Commercial Railroad | 2 |
FBOX
| TTX Company | 6 |
FSRR
| FerroSur | 4 |
FXE
| Ferromex | 2 |
GACX
| General American Marks Company | 1 |
GTW
| Grand Trunk Western | 1 |
HS
| H and S Railroad Company | 5 |
IBT
| International Bridge and Terminal Company | 1 |
ITFX
| INFINITY TRANSPORTATION III LLC | 5 |
J
| J | 4 |
KCS
| Kansas City Southern | 10 |
KYLE
| Kyle Railroad | 4 |
LRS
| Laurinburg and Southern | 5 |
LW
| Louisville and Wadley Railway Company | 3 |
MDW
| Minnesota Dakota and Western Railway Com | 11 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 5 |
MWCX
| Midwest Railcar Corporation | 2 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 1 |
NOKL
| Northwestern Oklahoma | 2 |
NS
| Norfolk Southern | 12 |
RBOX
| Railbox Company | 13 |
SLC
| San Luis Central Railroad Company | 2 |
SOU
| Southern | 18 |
SP
| Southern Pacific | 19 |
SRN
| Sabine River & Northern | 1 |
SRY
| Southern Railway of British Columbia Lim | 10 |
SSW
| St Louis Southwestern (Cotton Belt) | 4 |
TASD
| Terminal Alabama State Docks | 1 |
TBOX
| TTX Company | 10 |
TILX
| Trinity Industries Leasing Company | 1 |
TOE
| Texas Oklahoma and Eastern RR Company | 1 |
TR
| Tomahawk Railway L.P. | 3 |
UP
| Union Pacific Railroad Company | 1 |
UPP
| Union Pacific Passenger | 1 |
WP
| Western Pacific | 6 |
WRWK
| Providence & Worchester Railroad | 9 |