ABOX
| TTX Company | 3 |
ADN
| Ashley Drew & Northern | 1 |
AGR
| Alabama and Gulf Coast | 23 |
ALM
| Arkansas Louisiana and Mississippi Railr | 1 |
AM
| Arkansas & Missouri | 12 |
AN
| Apalachicola Northern | 6 |
AR
| Aberdeen and Rockfish | 5 |
ATW
| Atlantic and Western | 93 |
AVL
| Aroostook Valley Railroad Company | 1 |
BB
| Buckingham Branch | 1 |
BCLR
| Bay Colony | 1 |
BM
| Boston & Maine | 16 |
BN
| Burlington Northern | 7 |
CAGY
| Columbus & Greenville Railway | 5 |
CIRR
| Chattahoochee Industrial Railroad | 3 |
CN
| Canadian National Railways | 3 |
CNW
| Chicago & Northwestern | 1 |
CP
| Canadian Pacific Railway | 15 |
CPAA
| Canadian Pacific Railway | 39 |
CTR
| Clinton Terminal Railroad Company | 1 |
CUOH
| Columbus and Ohio River Railroad Company | 25 |
DOTX
| USDOT/Federal Railroad Administration | 1 |
ELS
| Escanaba and Lake Superior Railroad Comp | 51 |
FCRD
| First Coast Railway | 28 |
FSRR
| FerroSur | 186 |
FXE
| Ferromex | 98 |
GTRA
| Golden Triangle Railroad | 4 |
GWR
| Great Western Railway Company | 1 |
HS
| H and S Railroad Company | 16 |
ICG
| Illinois Central Gulf | 1 |
IFRX
| Infinity Rail LLC | 1 |
INRD
| Indiana Railroad | 3 |
KCS
| Kansas City Southern | 1 |
KCSM
| Kansas City Southern De Mexico | 2 |
KXHR
| Knoxville & Holston River RR | 2 |
LCRC
| Lenawee County Railroad | 1 |
LFCD
| Linea Coahuila Durango S.A. de C.V. | 1 |
LN
| Louisville & Nashville | 2 |
LNW
| Louisiana & Northwestern | 2 |
LRS
| Laurinburg and Southern | 24 |
LRWN
| Little Rock & Western | 51 |
LSI
| Lake Superior and Ishpeming Railroad | 1 |
LVRC
| Lamoille Valley | 1 |
MB
| Meridian & Bigbee | 118 |
MEC
| Maine Central | 4 |
MILW
| Milwaukee Road | 1 |
MNS
| Minneapolis Northfield & Southern | 1 |
MQT
| Marquette Rail | 23 |
NADX
| General Electric Rail Services | 1 |
NCTR
| North Central Texas Railroad | 1 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 25 |
OKKT
| Union Pacific Railroad Company | 1 |
PAL
| Paducah & Louisville | 2 |
PRL
| Penn Eastern Rail Lines Incorporated | 8 |
RBOX
| Railbox Company | 5438 |
RGCX
| Rio Grande Chemical LTD | 2 |
RJCD
| RJCD | 1 |
SBD
| Seaboard System | 1 |
SGLR
| Seminole Gulf | 16 |
SLC
| San Luis Central Railroad Company | 1 |
SLR
| St Lawrence & Atlantic | 3 |
SOU
| Southern | 20 |
SRN
| Sabine River & Northern | 6 |
TFM
| Kansas City Southern De Mexico | 8 |
TSE
| Texas South-Eastern Railroad Company | 39 |
TSRD
| Twin State Railroad Company | 2 |
USAX
| United States Army | 1 |
WGCR
| Wiregrass Central Railroad. Incorporated | 3 |
WLO
| Waterloo Railway Company (Illinois Central) | 3 |
WRWK
| Providence & Worchester Railroad | 9 |
WSOR
| Wisconsin & Southern | 4 |